You will fail unless you work hard.
如果你不积极工作,就会失败.
Let's have dinner out — unless you are too tired.
咱们出去吃饭吧——除非你太累了.
Substances have no tendency to expand unless (they are) heated.
除非受热,物质不会有膨胀的倾向.
I will be very angry unless you have already spoken to her.
除非你已经对她说过了,否则我会很生气.
Don't ask me to explain unless you really don't understand.
不要叫我解释,除非你真的不懂.
Unless paying by credit card,please pay in cash.
如果不用信用卡付账,就请付现金.
