Term of validity
[化] 有效期间\\n[经] 有效期限
🧩 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 want to take a few days off just for relaxation.
我想请几天假放松放松。
I meet the boy whose aunt is a musician.
我遇到那个男孩的姑妈是音乐家。
When it is eating normally, its own training begins.
当它进食正常了，训练就开始。