Impulsor
[数]非共面直线对
🗣️ 情景例句
How long does it take you to get through a letter?
你写一封信要花多少时间？
Everything is good in its season.
万物逢时皆美好。
At the far end of the lake, they came to huge piles of rubble which had been washed up by the water.
在湖的尽头，他们见到一大堆一大堆由湖水冲刷上岸的碎石。