zhè shì hōnggānjī.

这 means this.

In Mandarin, 这 can stand on its own before 是 in a sentence like 这是…… = This is ….

• 这 = this
• 这个 = this one / this + classifier 个

So:

• 这是烘干机。 = This is a dryer.
• 这个是烘干机。 = This one is a dryer.

Both can be natural, but 这是…… is the most direct match for This is ….

是 is the verb to be in this kind of sentence.

So the structure is:

• 这 = this
• 是 = is
• 烘干机 = dryer

Together: 这是烘干机。

A useful thing to know is that 是 is often used to link one noun to another noun, as in A is B.

Examples:

• 这是老师。 = This is a teacher.
• 这是我的朋友。 = This is my friend.

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

So 烘干机 can mean:

• a dryer
• the dryer

Which one is meant depends on context.

That is why 这是烘干机。 is perfectly complete without any extra word.

Not necessarily.

In a sentence like 这是烘干机。, you do not need a measure word. This is a normal noun-identification sentence.

You can say:

• 这是一个烘干机。

This means something like This is a dryer with a slightly more explicit a-type feeling.

But in many cases, native speakers simply say:

• 这是烘干机。

So:

• 这是烘干机。 = very natural
• 这是一个烘干机。 = also grammatical, often a bit more specific or explanatory

Yes. 烘干机 is a compound word:

• 烘 = to heat/bake/dry with heat
• 干 = dry
• 机 = machine

So 烘干机 literally means something like heat-drying machine.

This is very common in Mandarin: several meaningful parts combine to make a practical noun.

The dictionary pronunciation is zhè.

However, when 这 is followed by a classifier or certain words in natural speech, many speakers pronounce it more like zhèi:

• 这个 often sounds like zhège or zhèige
• 这本书 may sound closer to zhèiběn shū

But in your sentence:

• 这是烘干机。

reading 这 as zhè is completely correct.

Yes, very similar here.

The pattern is:

• 这 = this
• 是 = is
• 烘干机 = dryer

So the order is:

This + is + dryer

That makes this sentence especially beginner-friendly because it maps closely to English This is a dryer.

Yes, but that means something slightly different.

• 这是烘干机。 = This is a dryer.
• 这台烘干机 = this dryer

Here, 台 is a measure word commonly used for machines and appliances.

So:

• 这台烘干机很大。 = This dryer is very big.

But if you want the full sentence This is a dryer, you would say:

• 这是烘干机。

The pinyin is:

• 这 zhè — 4th tone
• 是 shì — 4th tone
• 烘 hōng — 1st tone
• 干 gān — 1st tone
• 机 jī — 1st tone

So the sentence is:

zhè shì hōnggānjī

A pronunciation note:

• Two 4th tones in a row, zhè shì, can sound a bit clipped in fast speech.
• Try to make each 4th tone fall clearly: zhè shì
• Then keep the three 1st tones level: hōng gān jī

Because 的 is not needed here.

的 is often used for possession or modification, such as:

• 我的书 = my book
• 红色的车 = red car

But 这是烘干机。 is a simple A is B sentence, so 的 does not belong there.

Saying 这是的烘干机 would be incorrect.

It is a correct and common word, especially for a drying machine.

Depending on region and context, you may also hear other terms, such as words specifically for a clothes dryer. But 烘干机 is a very normal and understandable word for a machine that dries things.

So for a learner, this is a solid vocabulary item to know.

A very common way is:

• 这是什么？ = What is this?

Then the answer can be:

• 这是烘干机。

You can also make a yes-no question with 吗:

• 这是烘干机吗？ = Is this a dryer?

So this sentence is useful both as an answer pattern and as a model for making simple identification questions.