qǐng bǎocún jiāoyìpíngzhèng.

请 means please in this sentence.

It is used to make the instruction more polite:

• 请保存交易凭证。 = Please keep/save the transaction receipt/proof.

In Mandarin, 请 + verb is a very common way to make a polite request or instruction.

On signs, receipts, apps, and official notices, 请 often sounds polite but still fairly formal.

It is basically a polite command/instruction.

Even though 请 can sound like a request, in contexts like:

• bank machines
• payment screens
• receipts
• customer notices

it usually means Please do this rather than a personal favor-request.

So 请保存交易凭证。 is best understood as:

• Please keep the transaction record.
• Please retain your transaction receipt/proof.

Mandarin often leaves out the subject when it is obvious from context.

Here, the sentence is speaking to the reader/user/customer, so Mandarin does not need to say:

• 你请保存交易凭证。
  or
• 请你保存交易凭证。

In notices and instructions, the subject is very often omitted.

So the sentence simply gives the instruction directly:

• 请保存交易凭证。

保存 literally means to preserve, keep, save, retain.

In this sentence, it means:

• keep
• retain
• save for later

So here it does not necessarily mean saving a file on a computer, although 保存 can also mean save in digital contexts.

Examples:

• 请保存文件。 = Please save the file.
• 请保存收据。 = Please keep the receipt.

In 请保存交易凭证。, the meaning is closer to retain/keep.

It is one two-syllable verb: 保存.

Its parts are:

• 保 = protect/keep
• 存 = store/exist

But in normal usage, you should learn 保存 as a single word meaning:

• to preserve
• to keep
• to save

So in this sentence, 保存 functions as one verb taking 交易凭证 as its object.

交易凭证 is a noun phrase meaning something like:

• transaction receipt
• transaction voucher
• proof of transaction
• transaction record

Breakdown:

• 交易 = transaction
• 凭证 = certificate, voucher, proof, document serving as evidence

Together, 交易凭证 refers to some document or record that proves a transaction happened.

Depending on context, it could be:

• a printed receipt
• a payment slip
• a transaction confirmation
• a transfer record

Because 交易凭证 is a normal compound noun in Mandarin.

In English, we also put nouns together directly:

• transaction receipt
• payment record
• bank statement

Mandarin often does the same thing without 的.

So:

• 交易凭证 = transaction proof/document

Using 的 here would sound less natural in many contexts:

• 交易的凭证

This is grammatically possible in some situations, but it sounds more explanatory and less like the fixed term used on receipts, screens, or formal notices.

凭证 means a document or item that serves as proof.

It is a fairly formal word. It can refer to:

• a receipt
• a voucher
• a certificate
• written proof
• supporting documentation

So 凭证 is broader than just receipt.

That is why 交易凭证 can sometimes be translated in different ways depending on context:

• receipt
• transaction record
• proof of transaction

No, not exactly.

• 交易凭证 = proof/record of a transaction
• 发票 = invoice, official tax receipt

A 发票 is a specific official document, especially important in Chinese-speaking business and tax contexts.

A 交易凭证 may just be:

• a receipt slip
• a payment confirmation
• a transfer record

So you should not automatically translate 交易凭证 as invoice.

Yes, you can.

• 请保存交易凭证。
• 请你保存交易凭证。

Both are grammatical.

The difference is tone and style:

• 请保存交易凭证。 = more neutral, concise, common in notices/instructions
• 请你保存交易凭证。 = more directly addressed to you

For a sign, receipt, or app message, the version without 你 is more natural.

Word by word:

• 请 qǐng
• 保存 bǎocún
• 交易凭证 jiāoyì píngzhèng

Full pronunciation:

• qǐng bǎocún jiāoyì píngzhèng

A useful pronunciation note: 请 and 保 are both third tone in citation form. In connected speech, the first of two third tones usually changes to a rising tone. So 请保... is often pronounced more like:

• qíng bǎo...

But the written tones stay the same:

• 请 = third tone
• 保 = third tone

This sentence is very common in formal or transactional situations, for example:

• at an ATM
• after a bank transfer
• on a payment confirmation page
• on a POS machine receipt
• in online banking
• after an e-commerce payment

It tells the customer to keep the transaction proof in case it is needed later.

Yes, but the meaning or tone may change a little.

Possible alternatives:

• 保留 = retain, keep
• 留存 = keep on file, retain for record
• 存档 = archive

Examples:

• 请保留交易凭证。
• 请留存交易凭证。

Compared with these:

• 保存 is very common and neutral
• 保留 emphasizes not throwing it away
• 留存 sounds more formal or administrative

So 请保存交易凭证。 is a natural standard phrasing.

Yes, pretty close.

The structure is:

• 请
  • verb
    • object

So:

• 请 = please
• 保存 = keep/save
• 交易凭证 = transaction proof/receipt

That gives:

• Please keep the transaction receipt/proof.

This is one reason the sentence is relatively easy for English speakers to understand once the vocabulary is known.