Chất thải nguy hại được để riêng.

Chất thải nguy hại means hazardous waste.

A quick breakdown:

• chất thải = waste, waste material
• nguy hại = harmful, hazardous, dangerous

In Vietnamese, descriptive words usually come after the noun, so:

• chất thải nguy hại = waste hazardous = hazardous waste

This is a common formal or technical expression, especially on signs, labels, and in regulations.

Because in Vietnamese, adjectives normally come after the noun they describe.

So:

• chất thải nguy hại = hazardous waste
• literally: waste hazardous

This is one of the biggest word-order differences from English. English usually puts adjectives before the noun, but Vietnamese usually puts them after it.

Other similar examples:

• nước sạch = clean water
• thực phẩm tươi = fresh food
• khu vực nguy hiểm = dangerous area

Here, được is being used to make the sentence sound passive or impersonal.

So:

• để riêng = to keep separate / to place separately
• được để riêng = is kept separate / is placed separately

The sentence does not say who does the action. That is very common in Vietnamese, especially in formal instructions and signs.

So the whole sentence means something like:

• Hazardous waste is kept separately
• Hazardous waste should be kept separate
  depending on context

On a sign, English often uses should be or just a short instruction, even if Vietnamese uses được.

No. Được has several uses in Vietnamese.

Common ones include:

• to get / receive
• can / be allowed to
• a passive-like marker

In this sentence, it is the passive-like use.

For example:

• Tôi được quà. = I received a gift.
• Tôi được nghỉ. = I am allowed to rest / I get to take a break.
• Cửa được mở lúc 8 giờ. = The door is opened at 8 o’clock.

So you have to understand được from context.

Both được and bị can appear in passive-type sentences, but they are not the same.

• được is usually neutral or positive
• bị is usually used for something negative or unwanted

Examples:

• Anh ấy được khen. = He was praised.
• Anh ấy bị phạt. = He was punished.

In Chất thải nguy hại được để riêng, the focus is just on the proper handling of hazardous waste. It is a neutral/formal statement, so được fits.

Using bị here would sound wrong because being kept separate is not something bad that happens to the waste.

Để riêng means to keep separate, to set aside, or to place separately.

Breakdown:

• để = to put, leave, place, keep
• riêng = separate, separately, distinct

Together, để riêng means that something is not mixed with other things.

In this sentence, the idea is that hazardous waste must be separated from regular waste or from other materials.

Yes. Để is a very flexible verb in Vietnamese.

Depending on context, it can mean:

• to put
• to leave
• to keep
• to let
• in some structures, even in order to when combined differently

Here it means something like put/keep.

So để riêng is not about “leave” in the sense of going away; it means keep it apart from other things.

Vietnamese often does not use a direct equivalent of English to be in the same way English does.

In this sentence, the predicate is the verb phrase:

• được để riêng = is kept separate

So Vietnamese does not need a separate word meaning is before it.

This is very normal in Vietnamese. English requires is, but Vietnamese often expresses the idea without a separate copula.

It can suggest either one depending on context.

Literally, it is closer to:

• is kept separately
• is placed separately

But in real-life usage, especially on signs, labels, or safety instructions, it often functions like:

• should be kept separate
• must be kept separate
• keep hazardous waste separate

Vietnamese safety wording is often shorter and less explicit than English about obligation, so context matters.

Yes, it sounds natural and formal, especially in technical, safety, or regulatory contexts.

It has the tone of an instruction or handling rule rather than casual speech.

In everyday conversation, people might also say things like:

• Chất thải nguy hại phải để riêng. = Hazardous waste must be kept separate.
• Để riêng chất thải nguy hại. = Keep hazardous waste separate.

But Chất thải nguy hại được để riêng sounds very suitable for official or written use.

Yes. Adding phải would make the obligation clearer.

Compare:

• Chất thải nguy hại được để riêng.
  = Hazardous waste is kept separately / should be kept separate

• Chất thải nguy hại phải để riêng.
  = Hazardous waste must be kept separate

So phải makes the rule stronger and more explicit.

Without phải, the sentence can sound more like a formal statement of procedure.

Sometimes, but waste is the best choice here.

• chất thải is a formal term meaning waste, often in environmental, medical, industrial, or legal contexts
• rác is more like everyday trash/garbage

So for chất thải nguy hại, the most natural English translation is hazardous waste, not hazardous trash.

A careful approximation is:

chất thải nguy hại được để riêng

Roughly:

jut thai nwee hai duhk day zyee-ng
or in southern speech, the r in riêng may sound more like y.

A few pronunciation notes:

• chất has a short vowel and a stop at the end
• thải has a rising-ish broken tone
• nguy sounds roughly like ngwee
• hại sounds roughly like hai with a heavy tone
• được is tricky; the vowel is not exactly like English
• riêng has the iê vowel combination and the ng ending

If you are learning pronunciation, it is best to listen to native audio, because tones and vowel quality matter a lot here.

The sentence does not say.

That is normal. Vietnamese often leaves the agent unstated when it is obvious, unimportant, or part of a general rule.

So:

• Chất thải nguy hại được để riêng.
  = Hazardous waste is kept separate.

It focuses on the required condition of the waste, not on the person handling it.

If you wanted to mention the person, you could, but it is usually unnecessary in this kind of sentence.