Validity of credit
[经] 信用状的有效期
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
I don't know. It's locked.
不知道， 锁着呢。
He's concentrating on learning English.
他集中精力学英语。
with their fellow scientists either in other countries or in universities,
和其他国家、其他大学同行们