You will fail unless you work hard.
如果你不積極工作,就會(huì)失敗.
Let's have dinner out — unless you are too tired.
咱們出去吃飯吧——除非你太累了.
Substances have no tendency to expand unless (they are) heated.
除非受熱,物質(zhì)不會(huì)有膨脹的傾向.
I will be very angry unless you have already spoken to her.
除非你已經(jīng)對(duì)她說過了,否則我會(huì)很生氣.
Don't ask me to explain unless you really don't understand.
不要叫我解釋,除非你真的不懂.
Unless paying by credit card,please pay in cash.
如果不用信用卡付賬,就請(qǐng)付現(xiàn)金.