三角函數中文名稱的由來

圖一：圓的弦，直徑是圓最大的弦

away ; away from

(1) 名詞 + away   .......遠

The town is five kilometers away.
這鎮離5公里遠。

Help is just a call away.
幫助就只是一通電話而已。

Being a happy farmer is only a call or an e-mail away.
當一個快樂農夫，就只需打一通電話或寄一封e-mail這麼簡單。

pick up 用法

接人

I can pick you up at bus station.

撿起

Please pick up the trash.