Arccosine
反余弦
??? 情景例句
When you have a business meeting in the United States, come to the appointment on time.
當你在美國有商務會晤時，一定要按時赴約。
Why are you so mean? I've never done anything to you.
兇什么兇？ 我又沒得罪你。
The month after next he'll fly to Tokyo.
再下個月他將飛往東京。