Variopter
(滑动)光学计算尺
🗣️ 情景例句
From me and Marilyn.
Marilyn和我送的。
I know the boy whose father is a scentist.
我知道那个男孩的父亲是科学家。
Insuring public or private property is a standard practice in most countries in the world.
承办公共财产或私人财产保险是世界上大部分国家的正常业务。