Precomputation
[航海]导航预行计算
🗣️ 情景例句
Yes, I took part in.
有，我参加了。
Your friend was here a week ago,wasn't he?
一个星期前，你的朋友曾在这里，是不是？
Now the other stuents open their eyes, and guess who has the eraser.
现在其余的学生张开眼，然后猜谁手里有橡皮擦。