Nó được phục hồi rồi được thả về tự nhiên.

Nó usually means it, and it can also mean he/she in some contexts. In this sentence, it most naturally refers to an animal or some other non-human being.

For English speakers, an important point is that nó is often fine for animals, but it can sound rude if used for an adult person unless the relationship/context makes that normal. So here, nó is probably it = the rescued animal.

Yes, it is essentially passive.

The pattern được + verb often shows that the subject receives an action:

• được phục hồi = was rehabilitated / was restored
• được thả = was released

So the sentence presents what happened to nó, not who did those actions.

Because there are two separate actions happening to the subject:

1. được phục hồi
2. được thả về tự nhiên

Repeating được makes both verbs clearly parallel and clearly passive.

In English, we might say It was rehabilitated and then released into the wild. Vietnamese often repeats the passive marker more explicitly.

Yes, it often can be omitted in natural speech if the meaning is still clear:

• Nó được phục hồi rồi thả về tự nhiên.

That still sounds understandable. But keeping the second được makes the structure clearer and more balanced:

• Nó được phục hồi rồi được thả về tự nhiên.

So the version with both được is fully natural and slightly more explicit.

Phục hồi means to restore, to recover, or to rehabilitate, depending on context.

In this sentence, if the subject is an injured or rescued animal, được phục hồi most likely means something like:

• was rehabilitated
• was nursed back to health
• recovered
• was restored to health

So this is not just abstract restoration; it likely refers to the animal’s condition improving before release.

Here rồi means something like then, and then, or after that.

It links the two events in sequence:

• first: được phục hồi
• then: được thả về tự nhiên

So rồi shows order, not just simple addition.

Not exactly.

English and can simply join two things without saying much about time. But rồi usually suggests sequence: one thing happens, and then the next thing happens.

So this sentence is closer to:

• It was rehabilitated, then released into the wild

rather than just:

• It was rehabilitated and released

Literally, it is something like:

• thả = release / let go
• về = back to / toward
• tự nhiên = nature / the natural environment

So thả về tự nhiên means release back into nature, which in natural English is often:

• release into the wild
• return to the wild

This is a very common idea when talking about rescued wild animals.

Về often gives the idea of going back to a place or state.

So in thả về tự nhiên, it suggests the animal is being released back to its natural environment, not just released in a general sense.

Compare:

• thả = release
• thả về tự nhiên = release back into nature / back into the wild

That về adds the idea of returning to where it belongs.

It is the same basic word, but the meaning depends on context.

Tự nhiên can mean:

• natural / nature
• naturally
• sometimes even suddenly in certain contexts

Here, because it follows về, it clearly means nature / the natural environment.

So về tự nhiên here is not naturally. It means back to nature.

Usually, yes. Thả về tự nhiên is a very natural phrase.

You may also hear:

• thả về môi trường tự nhiên = release back into the natural environment
• thả về rừng = release back into the forest
• thả lại tự nhiên = release back into nature

English often says into the wild, but Vietnamese commonly uses về tự nhiên or về môi trường tự nhiên.

The sentence does not say who did it. That is very normal in Vietnamese.

The focus is on what happened to the animal:

• it was rehabilitated
• it was released back into nature

If you wanted to mention the agent, you could add it, for example:

• Nó được trung tâm cứu hộ phục hồi rồi được thả về tự nhiên.
  = It was rehabilitated by the rescue center and then released back into the wild.

But if the agent is obvious or unimportant, Vietnamese often leaves it out.

Yes, very easily. Vietnamese often replaces pronouns with the noun itself if that is clearer.

For example:

• Con chim được phục hồi rồi được thả về tự nhiên.
• Con khỉ được phục hồi rồi được thả về tự nhiên.

This is often more natural when you want to remind the listener what is being talked about. Vietnamese frequently repeats nouns where English would prefer a pronoun.

Yes, it is natural and understandable.

It sounds like the kind of sentence you might see in a news report or rescue-center update about an animal.

Depending on context, some speakers might prefer a slightly fuller version such as:

• Nó được phục hồi sức khỏe rồi được thả về tự nhiên.
• Nó được chăm sóc phục hồi rồi được thả về tự nhiên.

Those versions make the idea of physical recovery even clearer. But the original sentence is still good Vietnamese.

A useful breakdown is:

• Nó = subject
• được phục hồi = passive verb phrase 1
• rồi = then
• được thả về tự nhiên = passive verb phrase 2

So the pattern is:

Subject + passive action 1 + then + passive action 2

That makes it a very good example of how Vietnamese chains events together while keeping the same subject throughout.