This is the 7622nd most frequent Chinese word.
身份证
Identification card (ID card).
Here, 身份证 is referred to as a document that, if lost, needs replacement, highlighting its importance.
丢失了身份证需要马上补办。
If you lose your ID card, you need to reissue it immediately.
This sentence uses 身份证 to mean a required proof of identity for entry into specific locations or events, showcasing regulatory requirements.
进入考场时，考生必须出示有效的身份证。
Examinees must present a valid ID card to enter the examination hall.
In this sentence, 身份证 denotes the form of identification necessary for completing official transactions, emphasizing its practical usage.