Dioptra
测量高度及角度用的一种光学装置
🗣️ 情景例句
You first, Audrey.
你先来， Audrey。
What is done cannot be undone.
木已成舟。
And anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.
凡是稍稍想过大海海底的人大概都会认为海底是平坦的。