Vertimeter
n. [空]升降速度計
??? 情景例句
May I ask who's calling?
請問你是誰？
We have an extended warranty available at extra cost.
對于額外價錢我們有較長的保證期限。
The children were leaving school on Tuesday when they saw a truck.
星期二，孩子們正放學回家，這時，他們看見一輛卡車。