Cân bưu kiện để biết trọng lượng.

Here, cân is a verb meaning to weigh.

So Cân bưu kiện means weigh the parcel.

A learner may know cân as a scale or as a unit related to weight in some contexts, but in this sentence it clearly functions as the verb to weigh.

Yes. Vietnamese often omits the subject when it is understood from context.

So Cân bưu kiện để biết trọng lượng could mean things like:

• Weigh the parcel to find out the weight
• You should weigh the parcel to know its weight
• One weighs the parcel to determine the weight

In many real situations, it sounds a lot like an instruction or command: Weigh the parcel to find out its weight.

Để often means in order to, so that, or for the purpose of.

In this sentence:

• Cân bưu kiện = weigh the parcel
• để biết trọng lượng = in order to know the weight

So để connects the action with its purpose.

A very common Vietnamese pattern is:

Verb + để + Verb

For example:

• Học để hiểu = Study in order to understand
• Làm để kiếm tiền = Work in order to earn money

Yes, biết often means to know, but in many contexts it can also mean to find out, to learn, or to determine.

In để biết trọng lượng, the meaning is not that you already know the weight. It means:

• to find out the weight
• to determine the weight

This is very natural in Vietnamese.

Bưu kiện means a parcel, package, or postal package.

It is a fairly specific term, often associated with mail, shipping, or delivery.

Compared with some related words:

• bưu kiện = parcel, postal package
• gói hàng = package, parcel, package of goods
• kiện hàng = shipment unit, package/crate/bale depending on context

So bưu kiện is a good choice if you are talking about something being mailed or shipped.

Both trọng lượng and cân nặng can be translated as weight, but they are not always used in exactly the same way.

• trọng lượng is a bit more formal, technical, or neutral
• cân nặng is very common in everyday speech, especially for a person’s body weight

In the context of a parcel, trọng lượng sounds very natural, especially in shipping, packaging, or logistics.

So:

• trọng lượng bưu kiện = the parcel’s weight
• cân nặng của bưu kiện = also understandable, but less typical in this kind of formal/shipping context

Vietnamese often leaves out possessive words when the meaning is obvious from context.

In English, you would normally say its weight. In Vietnamese, after saying bưu kiện, it is already clear that trọng lượng refers to the parcel’s weight.

So để biết trọng lượng naturally means:

• to know the weight
• understood as the weight of the parcel

If needed, Vietnamese could make it more explicit:

• để biết trọng lượng của bưu kiện = to know the weight of the parcel

But that is less concise and often unnecessary.

The structure is:

Cân + bưu kiện + để + biết + trọng lượng

Breaking it down:

• Cân = weigh
• bưu kiện = parcel
• để = in order to
• biết = know / find out
• trọng lượng = weight

So the overall pattern is:

Verb + Object + Purpose marker + Verb + Object

This is very common in Vietnamese.

Yes, it very easily can.

Because Vietnamese often omits the subject, a bare verb at the beginning can sound like an instruction. So Cân bưu kiện để biết trọng lượng can naturally be understood as:

• Weigh the parcel to find out the weight

This kind of phrasing is common in instructions, labels, workplace directions, or procedural writing.

If you wanted to make it more explicitly a command, you could add words like:

• Hãy cân bưu kiện để biết trọng lượng. = Weigh the parcel to find out the weight.

But the original sentence already works well as an instruction.

Yes. That is a very natural English rendering.

Even though the Vietnamese literally uses trọng lượng = weight, English often expresses the same idea more naturally as:

• Weigh the parcel to find out how heavy it is
• Weigh the parcel to know its weight

Both capture the meaning well.

A rough pronunciation guide is:

Cân bưu kiện để biết trọng lượng
≈ gun byoo kee-uhn day byet jong lwuhng

A few notes:

• cân has the â vowel, which is shorter and more central than English a
• bưu begins with a sound somewhat like byoo
• kiện has a falling/glottalized tone in the Southern accent and a nặng tone in standard spelling
• để starts with đ, which is like English d, not z
• biết has an ending like -et, but clipped
• trọng lượng can be difficult because of the tr cluster and the ượng vowel combination

If you are learning pronunciation, it is especially important to hear this from native audio, because the tones matter a lot.

Yes, absolutely.

You can say:

Cân bưu kiện để biết trọng lượng của bưu kiện.

This is grammatically correct, but it sounds more repetitive because bưu kiện has already been mentioned.

Vietnamese often prefers the shorter version when the meaning is clear:

Cân bưu kiện để biết trọng lượng.

So the shorter sentence is usually the more natural one.