Per mil
每千
🧩 词语组成解析
per
[pə:, pə]
prep. 由;（表示根据）依照;（表示比率）（尤指数量，价格，时间）每;
adv. 每次;每个;照常;按惯例;
adj. 高的，过的，全的;
n. 千分之一英寸\\n[计] 毫英寸; 密耳; 军队域名
🗣️ 情景例句
He says there's another inn
他说还有另一家旅馆，
If she gets mad with him, she will not speak to him for days.
她对他一生气就会许多天不跟他说话。
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。