otherwise是什么意思

　　例句：

　　Conditions should be laid down. Otherwise it's all talk.

　　應該先定下條件，否則全是空談。

　　Don't start giving me problems otherwise I'll have to be very unpleasant indeed.

　　不要開始給我找麻煩，否則我就不客氣了。

　　Shut the window, otherwise it'll get too cold in here.

　　把窗戶關好，不然屋子里就太冷了。