Valid period
[化] 有效期限\\n[经] 有效期限
🧩 词语组成解析
period
['pɪrɪəd]
n. 时期;（一段）时间;学时;句号;
adj. 具有某个时代特征的;（关于）过去某一特定历史时期的;（家具、服饰、建筑等）某一时代的;
peri周围，靠近+od道路→周期
🗣️ 情景例句
It's getting late.
时间不早了。
She began playing the violin when she was nine.
她从九岁就开始练习小提琴。
I think that young children often appreciate modern pictures better than anyone else.
我觉得小孩子们往往比任何人都更能欣赏现代绘画，