watasitati ha kidouibutuzyokyo wo rensyuusuru.

It is read:

わたしたちは　きどういぶつじょきょ　を　れんしゅうする。

Without the teaching spaces, it is normally written:

私たちは気道異物除去を練習する。

They are particles.

• は marks the topic: 私たち
  This gives the sense of as for us or simply we.
• を marks the direct object: 気道異物除去
  This is the thing being practiced.

So the basic pattern is:

私たち は 気道異物除去 を 練習する。
[topic] + は + [object] + を + [verb]

When は is used as the topic particle, it is pronounced wa. This is a standard spelling rule in Japanese based on older historical pronunciation.

So:

• は as part of a normal word is usually ha
• は as a particle is usually wa

In this sentence, it is definitely the particle, so you read it as わ.

Yes, very often.

Japanese frequently leaves out the subject or topic when it is already clear from context. So in many real situations, people might simply say:

気道異物除去を練習する。

That could still mean We practice airway foreign body removal, I practice..., or something similar, depending on context.

Including 私たち makes the subject explicit, which can be useful in teaching materials or when contrast is important.

It is a technical compound noun made of three parts:

• 気道 = airway
• 異物 = foreign object / foreign body
• 除去 = removal

So the whole compound means something like:

• airway foreign-body removal
• removal of a foreign object from the airway

Japanese often stacks nouns together in this compact way, especially in medical or technical language.

Here, it functions as a noun.

That is why it can take the particle を:

• 気道異物除去を = airway foreign body removal as the object

Then 練習する is the verb: to practice.

So the sentence is structurally closer to:

We practice [airway foreign body removal].

Even though English might express the idea with a verb phrase, Japanese often uses a noun compound like this.

練習 is a noun meaning practice.
When you add する, it becomes the verb to practice.

So:

• 練習 = practice
• 練習する = to practice

This is very common in Japanese. Many nouns can become verbs with する.

Examples:

• 勉強する = to study
• 運動する = to exercise
• 練習する = to practice

練習する is the plain non-past form.

In Japanese, the non-past can mean:

• a habitual action: we practice
• a future action: we will practice

The exact meaning depends on context.

So this sentence could mean:

• We practice airway foreign body removal
• We will practice airway foreign body removal

If you want to specifically say are practicing right now, Japanese would usually use:

練習している

Change 練習する to 練習します:

私たちは気道異物除去を練習します。

That is the polite version.

So:

• 練習する = plain form
• 練習します = polite form

The original sentence is not rude; it is just plain style, which is common in dictionaries, textbooks, notes, and informal speech.

Yes, it is understandable, especially in a medical or training context, but it sounds fairly technical and compact.

A speaker might also say:

• 私たちは気道異物除去の練習をする。
• 私たちは気道異物の除去を練習する。

These alternatives unpack the phrase a little.

A useful nuance:

• 気道異物除去を練習する sounds concise and technical
• 気道異物除去の練習をする explicitly says do practice of airway foreign body removal

The original sentence is fine, especially in educational or professional material.

Normally, Japanese is written without spaces.

So the standard writing is:

私たちは気道異物除去を練習する。

Spaces are often added only in beginner materials to make the sentence structure easier to see. They are not usually used in normal Japanese writing.

Japanese often links nouns directly together in compounds, especially in formal, scientific, or medical vocabulary.

English often needs words like of, for, or from, but Japanese can compress the same idea into one noun string.

So instead of something that literally mirrors English, Japanese may use a compact compound like:

気道 + 異物 + 除去

This is one reason technical Japanese can look dense at first. The good news is that once you learn the smaller parts, these compounds become much easier to understand.