Le secouriste comprime la plaie.

French nouns have grammatical gender, so the definite article changes to match the noun.

• le secouriste = the first aider / rescuer with a masculine singular article
• la plaie = the wound with a feminine singular article

So le and la both mean the, but they agree with different nouns.

In this sentence, secouriste is masculine because it uses le.

But the noun itself can refer to either a man or a woman:

• le secouriste = the male first aider
• la secouriste = the female first aider

So secouriste is one of those profession nouns whose form often stays the same, while the article shows the gender.

Comprimer is the infinitive, meaning to compress.

In the sentence, the verb has to be conjugated to match the subject le secouriste, which is third person singular, so you get:

• je comprime
• tu comprimes
• il / elle comprime
• nous comprimons
• vous comprimez
• ils / elles compriment

So Le secouriste comprime la plaie uses the correct present-tense form for he/she compresses.

It can mean either, depending on context.

French often uses the simple present where English might use either:

• compresses
• is compressing

So this sentence could naturally mean:

• The first aider compresses the wound
• The first aider is compressing the wound

If you really want to stress the ongoing action, French can also use être en train de, but that is not necessary here.

Because comprimer is a direct transitive verb in French. It takes a direct object:

• comprimer la plaie = to compress the wound

English sometimes uses slightly different verb patterns, but in French you say it directly.

A different French verb might use a preposition, for example:

• appuyer sur la plaie = to press on the wound

So comprimer la plaie and appuyer sur la plaie are both possible ideas, but they use different grammar.

Not exactly.

• plaie usually means a wound, especially an open wound, cut, or break in the skin
• blessure is broader and means an injury

So a plaie is a specific kind of blessure. In a first-aid context, plaie is very natural if someone is treating a wound directly.

French often uses the definite article when the thing is already clear from context.

So if everyone knows which wound is being treated, la plaie sounds natural.

French does this a lot, especially when the reference is obvious. If needed, you could say:

• sa plaie = his wound / her wound

But la plaie is perfectly normal when the wound is already identified in the situation.

Plaie is pronounced as one syllable, roughly like plè.

A rough pronunciation of the whole sentence is:

luh suh-koo-reest kom-preem lah plè

A few useful points:

• secouriste ends with a pronounced st sound
• comprime has a silent final e
• plaie is just one syllable, not two

Not always.

Secouriste usually means someone trained to give first aid or emergency assistance. Depending on context, it can be translated as:

• first aider
• rescuer
• sometimes emergency responder

It does not automatically mean a fully qualified paramedic. The exact English word depends on the situation.

It sounds normal and natural, especially in a first-aid or medical context.

It is clear, direct, and practical. That is exactly the kind of style you often see in instructions or descriptions of emergency care.

So it is not strange or overly formal. It just sounds like standard French used in a health or rescue situation.