zhè shì jǐnjí wéixiū.

A very literal breakdown is:

• 这 = this
• 是 = is / am / are
• 紧急 = urgent / emergency
• 维修 = maintenance / repair

So the sentence literally reads something like This is emergency maintenance/repair.

In natural English, you would usually say:

• This is an emergency repair.
• This is emergency maintenance.

Depending on context, 维修 can mean either repair or maintenance.

是 is the Mandarin to be verb used to link one noun phrase to another.

In this sentence:

• 这 = this
• 是 = is
• 紧急维修 = emergency maintenance / emergency repair

So the structure is:

这 + 是 + 紧急维修
= This is emergency maintenance.

A common beginner pattern is:

• 这是老师。 = This is a teacher.
• 这是我的书。 = This is my book.
• 这是紧急维修。 = This is emergency maintenance.

Because 紧急维修 is a normal modifier + noun combination.

• 紧急 modifies 维修
• together they form urgent/emergency maintenance

In Mandarin, 的 is often omitted when the modifier and noun form a close, common phrase.

Compare:

• 紧急情况 = emergency situation
• 紧急会议 = emergency meeting
• 紧急维修 = emergency maintenance

If you said 紧急的维修, it is not impossible, but it sounds more marked or descriptive, as if you are emphasizing that the repair is urgent. In many ordinary cases, 紧急维修 is the more natural form.

It is best understood as two words working together:

• 紧急 = urgent / emergency
• 维修 = maintenance / repair

Together they act like a single unit meaning emergency maintenance or urgent repair.

This is very common in Mandarin: two words combine into a short phrase without needing any extra marker.

维修 can function as both a verb and a noun, depending on context.

As a verb:

• 他们在维修机器。
• They are repairing/maintaining the machine.

As a noun:

• 这是紧急维修。
• This is emergency maintenance.

This flexibility is very common in Chinese. Many words do not change form the way English words do.

It can be natural, but it depends a lot on the situation.

这是紧急维修 sounds like a label, notice, or explanation such as:

• This is emergency maintenance.
• This is an emergency repair.

However, in many real-life situations, native speakers might say something a little fuller, for example:

• 这是紧急维修工程。 = This is an emergency repair project.
• 现在正在进行紧急维修。 = Emergency repairs are currently underway.
• 这是因为设备故障而进行的紧急维修。 = This is emergency maintenance being carried out because of equipment failure.

So the original sentence is understandable, but in real contexts Chinese often adds a bit more information.

Mandarin does not use articles like a, an, or the the way English does.

So:

• 这是书。 can mean This is a book
• 这是老师。 can mean This is a teacher
• 这是紧急维修。 can mean This is an emergency repair / emergency maintenance

You do not need to add a special word for an.

Usually, that sounds less natural.

Why? Because 维修 often behaves like an activity or category rather than a simple countable object. So 一个 is often unnecessary or awkward here.

More natural options would be:

• 这是紧急维修。
• 这是一次紧急维修。

一次 works better if you want to emphasize one repair event / one maintenance operation.

So:

• 一个紧急维修 = usually not the best choice
• 一次紧急维修 = much more natural if you mean one emergency repair

The pinyin is:

Zhè shì jǐnjí wéixiū.

Tone by tone:

• 这 zhè = 4th tone
• 是 shì = 4th tone
• 紧 jǐn = 3rd tone
• 急 jí = 2nd tone
• 维 wéi = 2nd tone
• 修 xiū = 1st tone

A natural rhythm is:

Zhè shì | jǐnjí wéixiū.

A quick pronunciation tip:

• zh in zhè sounds like a retroflex sound, somewhat like the j in English judge, but with the tongue curled back more.
• jǐn and jí should be clearly different in tone: low/dipping for jǐn, rising for jí.

Both can relate to repairing, but they are not always identical.

维修

• often means maintenance and repair
• often used for equipment, systems, machinery, infrastructure
• can sound more formal or technical

修理

• often means to fix
• can be more general and everyday
• often used when something is broken and you fix it

Examples:

• 维修电梯 = maintain/repair an elevator
• 修理自行车 = fix a bicycle

So 紧急维修 sounds especially natural in technical, professional, or infrastructure-related contexts.

Not exactly.

这是紧急维修 identifies something as emergency maintenance/repair.

If you want to say This is being urgently repaired or They are carrying out emergency repairs, you would usually need a different structure, such as:

• 这正在紧急维修。
  This is not very natural by itself unless the subject is very clear.

More natural examples:

• 这里正在进行紧急维修。 = Emergency repairs are underway here.
• 设备正在紧急维修。 = The equipment is currently undergoing emergency repair.
• 他们正在紧急维修。 = They are urgently repairing it.

So the original sentence is more like a label or classification, not an action-in-progress sentence.

Sometimes, but not always.

• 这 = this
• 这个 = this one / this thing

In 这是紧急维修, using 这 is completely normal before 是.

You can also say 这个是紧急维修, but that usually sounds a little more conversational or contrastive, like:

• 这个是紧急维修，那个不是。
• This one is emergency maintenance; that one isn’t.

So in a simple statement, 这是... is the most basic and common pattern.

You can make it a yes-no question in a few common ways:

1. Add 吗

   • 这是紧急维修吗？
   • Is this emergency maintenance?

2. Use the A-not-A pattern

   • 这是不是紧急维修？
   • Is this emergency maintenance or not?

Both are common. The 吗 version is simpler for beginners.

Possible situations include:

• pointing to a work order or notice
• explaining a maintenance category
• identifying the type of repair work being done
• labeling a project or operation

For example:

• 这不是普通检查，这是紧急维修。

• This isn’t a routine inspection; this is emergency maintenance.

• 这个项目是什么？这是紧急维修。
• What is this project? This is emergency repair work.

So the sentence works best when you are identifying what something is.