Vaild period
[法] 有效期
🧩 词语组成解析
[法] 有效的, 经过正当手续的, 正当的
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
Well, it's done. Tomorrow morning at a publisher's office.
好了， 事情办成了。明天早晨要到出版社老板的办公室。
The outdoor concert was called off due to the weather.
露天音乐会由于天气原因被取消。
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
测出回声间隔的时间，便可算出该处海洋的深度。