Medicul veterinar aduce vaccinul.

-ul is the Romanian definite article attached to the end of the noun.

So:

• medic = doctor
• medicul = the doctor
• vaccin = vaccine
• vaccinul = the vaccine

Unlike English, Romanian usually puts the at the end of the noun instead of using a separate word.

In this sentence, both nouns are definite:

• medicul veterinar = the veterinarian / the veterinary doctor
• vaccinul = the vaccine

Because in Romanian, when a noun is followed by an adjective, the definite article usually goes on the noun, not on the adjective.

So:

• medic veterinar = veterinary doctor / veterinarian
• medicul veterinar = the veterinary doctor / the veterinarian

Here, medicul is the noun and veterinar is the adjective, so only medicul takes the definite article.

In Romanian, adjectives often come after the noun.

So:

• medic veterinar literally looks like doctor veterinary
• but it means veterinary doctor, or more naturally in English, veterinarian

This noun + adjective order is very normal in Romanian.

Yes. Medic veterinar is the standard and very common way to say veterinarian.

You may also hear veterinar by itself in casual speech, but medic veterinar is the full, standard expression.

So in this sentence:

• Medicul veterinar = The veterinarian

Aduce is the 3rd person singular present tense form of the verb a aduce, meaning to bring.

So:

• a aduce = to bring
• aduce = he/she/it brings

Since the subject is medicul veterinar, the sentence means:

• The veterinarian brings the vaccine
• depending on context, it could also mean The veterinarian is bringing the vaccine

Romanian present tense often covers both simple present and present continuous meanings.

Romanian often does not use subject pronouns unless they are needed for emphasis or clarity.

The verb form aduce already tells you the subject is 3rd person singular: he/she/it brings.

And since the sentence already has the noun medicul veterinar, there is no need to add el.

So Romanian prefers:

• Medicul veterinar aduce vaccinul.

rather than:

• El aduce vaccinul. if you want to say He brings the vaccine
• Medicul veterinar el aduce vaccinul. which would usually sound unnecessary

The main clue is word order.

Romanian often uses the same basic order as English:

• subject + verb + object

So here:

• Medicul veterinar = subject
• aduce = verb
• vaccinul = direct object

That gives:

• The veterinarian
  • brings
    • the vaccine

Also, the meaning makes this very natural: a veterinarian brings a vaccine, not the other way around.

One important detail: in this sentence, both medicul and vaccinul have forms that could be nominative or accusative, so the endings alone do not clearly distinguish subject from object. Word order and meaning do most of the work here.

Yes.

Romanian present tense often does the job of both:

• English brings
• English is bringing

So Medicul veterinar aduce vaccinul could mean:

• The veterinarian brings the vaccine
  or
• The veterinarian is bringing the vaccine

The context tells you which is more natural.

Yes, but it would change the meaning.

• vaccinul = the vaccine
• vaccin = a vaccine or just vaccine in a more general sense, depending on context

So:

• Medicul veterinar aduce vaccinul. = The veterinarian brings the vaccine.
• Medicul veterinar aduce un vaccin. = The veterinarian brings a vaccine.

If the meaning shown to you is the vaccine, then vaccinul is exactly right.

A helpful approximate pronunciation is:

MEH-di-cool veh-teh-ree-NAR ah-DOO-cheh vak-CHEE-nool

A few useful notes:

• c before i or e is often pronounced like ch
  • so vaccinul sounds roughly like vak-chee-nool
• ce in aduce sounds like che
  • so aduce sounds roughly like ah-doo-che
• Romanian vowels are usually pronounced clearly, not reduced as much as in English

Yes, it is completely natural.

It is a straightforward sentence with normal word order:

• Medicul veterinar = the subject
• aduce = the verb
• vaccinul = the object

It is the kind of sentence you might see in a textbook because it clearly shows:

• the definite article attached to nouns
• noun + adjective order
• a common present-tense verb
• standard subject-verb-object structure