Variopter
(滑动)光学计算尺
🗣️ 情景例句
When are you planning to get married?
你准备什么时候结婚？
When sorrows come, they come not single spies, but in battalions.
祸不单行。
and we know something of the great variety of the sea bed's topography.
而且我们对海底地形的千变万化也有了一定的了解。