Arctangent
反正切
??? 情景例句
I got the first round.
第一輪我請的客。
The older the goose the harder to pluck.
越老越狡猾。
We'll have to buy some more bricks. I don't think these will be enough.
我們需要買更多的磚。我認(rèn)為這些不夠。