kono kikai wo atukau.

この means this and must be followed by a noun, so この機械 means this machine.

By contrast:

• これ = this one / this thing
• この + noun = this ...

So:

• これを扱う。 = Handle this.
• この機械を扱う。 = Handle this machine.

The particle を marks the direct object of the verb. In other words, it shows what is being handled or operated.

Here:

• 機械 = machine
• 機械を = the machine / machine as the thing being acted on
• 扱う = to handle, deal with, operate

So 機械を扱う means to handle/operate the machine.

The reading is:

• 機械 → きかい
• 扱う → あつかう

So the full sentence is read:

この きかい を あつかう。

Not exactly. 扱う has a broader meaning than simple use.

Common meanings of 扱う include:

• to handle
• to deal with
• to treat
• to manage
• sometimes to operate, depending on context

With 機械, it often means something like:

• to handle a machine
• to operate a machine

But 扱う is more general than a verb like 使う (to use).

For example:

• 道具を使う = use a tool
• 機械を扱う = handle/operate a machine

So in this sentence, 扱う suggests dealing with the machine properly, possibly as equipment that requires skill.

扱う is the dictionary form (plain form) of the verb.

Japanese often uses the plain form in:

• dictionary entries
• casual speech
• written instructions or labels
• simple example sentences

If you want the polite form, it becomes:

• この機械を扱います。

So the difference is mainly plain vs. polite style, not a change in core meaning.

Yes, the subject is omitted, which is very normal in Japanese.

この機械を扱う。 could mean:

• I handle this machine.
• You handle this machine.
• He/She handles this machine.
• (Someone) handles this machine.

The subject is understood from context.

Japanese often leaves out information that is already clear to the listener or reader.

Yes. 扱う is flexible, so the exact English translation depends on context.

Possible translations include:

• handle this machine
• operate this machine
• deal with this machine

If the context is about using equipment, operate may fit well. If the context is more general, handle is often the safest translation.

So the Japanese is slightly broader than any one English verb.

Japanese is normally written without spaces. The sentence would usually appear as:

この機械を扱う。

Spaces are often added in beginner materials to make it easier to see the word boundaries:

• この / 機械 / を / 扱う

But in natural Japanese writing, spaces are usually not used.

Yes. この points to a specific machine that is near the speaker, near the listener, or otherwise identifiable in context.

Japanese demonstratives work like this:

• この = this ...
• その = that ... near the listener / that ... just mentioned
• あの = that ... over there

So この機械 means this machine, not just a machine.

Yes, very often. 扱う is used with many kinds of objects and topics.

For example:

• 商品を扱う = deal in products / carry products
• 問題を扱う = deal with a problem
• データを扱う = handle data
• 危険物を扱う = handle dangerous materials

So in この機械を扱う, the verb is being used in one of its common senses: handling or operating something.

Yes, as a short example sentence it is natural. However, by itself it feels a little context-dependent, because Japanese often relies on context.

Depending on the situation, a full natural sentence might be:

• 私はこの機械を扱う。 = I handle this machine.
• 彼はこの機械を扱う。 = He handles this machine.
• この機械を扱います。 = I/you/he/she handle(s) this machine. (polite, subject omitted)

So この機械を扱う。 is grammatically fine, but in real conversation it usually appears within a larger context.

A useful pronunciation point is that を is pronounced o, even though it is written with the kana を.

So:

• 機械を sounds like kikai o

Also, try to keep the vowels clear:

• きかい = ki-kai
• あつかう = a-tsu-ka-u

Do not turn 扱う into something like atsukō; pronounce the final う clearly.