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
Being a mother is not easy,
当一个母亲真不容易，
If I buy that car, I'll have to use all my savings.
如果我要买那辆车的话，我必须用尽我的积蓄。
There is a river in the picture.
画里面有一条河。