Per ann.
abbr. per annum
🧩 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;
🗣️ 情景例句
Don't be such a grouch.
不要总是牢骚满腹。
Feed by measure and defy physician.
饮食有节制，医生无用处。
he had great difficulty in controlling the car because a tyre burst during the first run.
但他很难把汽车控制住，因为在开始的行程中爆了一只轮胎。