shūjià yě xūyào chāixiè.

In Chinese, 也 usually comes before the verb phrase and after the topic or subject.

So in:

书架 也 需要 拆卸。

the structure is:

• 书架 = the bookshelf
• 也 = also
• 需要拆卸 = needs to be disassembled

A very literal word order is:

The bookshelf also needs disassembly.

English often puts also in different places, but in Chinese, 也 normally goes before what it is modifying in the predicate.

For example:

• 我也去。 = I’m going too.
• 他也知道。 = He also knows.
• 书架也需要拆卸。 = The bookshelf also needs to be disassembled.

Because Chinese often does not use a passive structure where English would.

In English, we say:

The bookshelf needs to be disassembled.

That is passive in meaning. But in Chinese, it is very natural to say:

书架需要拆卸。

This literally looks more like:

The bookshelf needs disassembly.

So 需要 + verb can express the idea that something needs to be done to the object, without using 被.

Using 被 here would usually sound unnecessary or unnatural:

• natural: 书架需要拆卸。
• less natural here: 书架需要被拆卸。

So this is a very common Chinese pattern:

• 这个文件需要修改。 = This document needs to be revised.
• 门需要修理。 = The door needs to be repaired.
• 书架也需要拆卸。 = The bookshelf also needs to be disassembled.

Yes. 需要 can be followed by:

1. a noun
2. a verb phrase

Here it is followed by the verb 拆卸.

Examples:

• 我需要时间。 = I need time.
  (时间 is a noun)

• 我需要休息。 = I need to rest.
  (休息 is a verb)

• 书架需要拆卸。 = The bookshelf needs to be disassembled.
  (拆卸 is a verb)

So this pattern is completely normal.

Both relate to taking something apart, but 拆卸 is usually a bit more formal, technical, or specific.

• 拆 = to take apart, tear down, dismantle; very common and broad
• 拆卸 = to disassemble, uninstall, dismantle; often used for furniture, machines, equipment, parts, etc.

So with furniture like a bookshelf, 拆卸 sounds quite natural, especially in instructions, moving, shipping, or assembly contexts.

Compare:

• 把箱子拆开。 = Open/take apart the box.
• 需要拆卸家具。 = The furniture needs to be disassembled.

In casual speech, people might simply say:

• 书架也得拆。
• 书架也要拆。

These sound more conversational than 书架也需要拆卸。

Chinese does not need a word equivalent to English to be in this kind of sentence.

English says:

The bookshelf needs to be disassembled.

Chinese says:

书架也需要拆卸。

Chinese often expresses the idea more directly, without an extra to be. The sentence is not missing anything; it is complete as it stands.

This is common in Chinese when expressing what needs doing:

• 房间需要打扫。 = The room needs cleaning.
• 电脑需要修理。 = The computer needs repairing.
• 书架也需要拆卸。 = The bookshelf also needs to be disassembled.

No, not in this sentence.

You use a measure word like 一个书架 when you are counting or specifically saying one bookshelf.

But here, 书架 is just the noun acting as the subject/topic, so no measure word is needed.

Compare:

• 一个书架 = one bookshelf
• 这个书架 = this bookshelf
• 书架也需要拆卸。 = The bookshelf / bookshelves also need disassembly, depending on context

Chinese often leaves number and article information unstated if the context already makes it clear.

By itself, 书架 does not tell you whether it is singular or plural. Chinese nouns usually do not change form for number.

So 书架也需要拆卸。 could mean:

• The bookshelf also needs to be disassembled.
• The bookshelves also need to be disassembled.

The actual meaning depends on context.

If you want to make it clearly singular or plural, you can add more information:

• 这个书架也需要拆卸。 = This bookshelf also needs to be disassembled.
• 这些书架也需要拆卸。 = These bookshelves also need to be disassembled.

The pinyin and tones are:

• 书架 = shūjià → first tone + fourth tone
• 也 = yě → third tone
• 需要 = xūyào → first tone + fourth tone
• 拆卸 = chāixiè → first tone + fourth tone

A few pronunciation notes:

• shū: the sh is a retroflex sound, not the same as English sh in every accent, but close enough for many learners at first.
• jià: make sure this is fourth tone, falling sharply.
• yě: third tone can be tricky. In connected speech, it is often not pronounced as a full deep dipping tone, but you should still learn it as third tone.
• xū: this x is not like English x. It is pronounced with a light, hissy sound made with the tongue close to the roof of the mouth.
• xiè in 拆卸 also uses that same x sound.

The overall rhythm is fairly natural if you say:

shūjià yě xūyào chāixiè

with clear stress on the content words rather than on 也.

All three can relate to necessity, but they are not exactly the same.

1. 需要

This means need to and is slightly more neutral or formal.

• 书架也需要拆卸。
• The tone is matter-of-fact.

2. 要

This can mean want to or need to / be going to, depending on context.

• 书架也要拆。
• This sounds more conversational.
• It can mean the bookshelf also has to be taken apart.

3. 得

This often means have to / must, especially in speech.

• 书架也得拆。
• This sounds even more colloquial and practical.

So in your sentence, 需要 sounds a bit more formal, like something from instructions, planning, or a discussion about moving or installation.

Yes, but it sounds a bit more formal or written than casual speech.

书架也需要拆卸。 is natural in contexts like:

• moving furniture
• assembly instructions
• customer service
• logistics
• written notes or planning

In everyday spoken Mandarin, people might more often say:

• 书架也要拆。
• 书架也得拆。
• 书架也要拆开。

So the original sentence is correct and natural, but it has a slightly more formal or practical tone.

Yes, and that is exactly how Chinese often works.

The sentence focuses on the state or requirement of the bookshelf, not on who will do the action.

So 书架也需要拆卸。 means the bookshelf is another item on the list of things that must be taken apart. The person doing it is unimportant or understood from context.

This is very common in Chinese. The language often leaves out the agent when it does not matter.

If you wanted to mention the person, you could say something like:

• 我们也需要拆卸书架。 = We also need to disassemble the bookshelf.

But in the original sentence, the focus is simply on the bookshelf itself.