介词
1. unless
1. Nothing will come out of it unless disaster.
这种事除非引起灾祸之外不会有什么结果。
连词
1. I won''t apologize unless she apologizes first.
除非她先道歉，否则我不道歉。
2. My baby sister never cries unless she is hungry.
我刚出生的妹妹除非饿了，她是从来不哭的。
3. This baby seldom cries unless he is tired.
这个婴儿除非在疲倦时很少哭。
4. Unless he studies hard, he will never pass the examination.
他如果不努力学习，就永远不能考及格。
Heating & Air-Conditioning-(暖气和空调)
A：Wow, you keep this place cold.
哇，你这个地方真够凉快的。
B：Yep. It’s cold in the summer, hot in the winter.
是。冬暖夏凉。
A：Your electricity bills must be enomp3ous.
你的电费可不得了吧。
B：Yeah, well, it’s a small price to pay to be comfortable, in my mind.
是呀，可是，我觉得要住得舒适这点钱不算什么。
A：It is nice to come in here after a run.
跑步完进来这里真不赖。
B：Yeah. The central heating and air-conditioning works like a champ3.
是呀，中央冷暖系统简直妙不可言。
A：I usually don’t use it unless it gets really hot. I just open up some windows, and I’m fine.
除了真的非常热我是不会用（空调）的。就把窗户打开，这样就很好了。
B：My friend’s family did the same thing. I could never get used to it, though.
我朋友家里也是这样。可是我可不习惯。
Learning English-(学英语)
A：Ralph, do me a favor, will you?
拉尔夫，帮我一个忙，好吗？
B：That all depends on what it is.
这要看帮什么忙。
A：This is the proble, I'm still having trouble with my English.The instructor suggests that I ask an American to help me by telling me how he says the things I say which just aren't English.I wanted you to be the American.
我有个困难。我的英语仍然遇到麻烦。老师建议我请一位美国人帮助，要他告诉我，我说的那些根本不像英语的话应当怎样说。我想要你做这个美国人。
B：What good'll it do?You never speak English unless you absolutely have to.I'll help you if you promise to speak noting but English all the time.
这有什么用？你除了非说不可的时候，你从来不说英语。好吧！我跟你达成一个协议：如果你保证在任何时候除了英语外什么也不说，我就帮助你。
A：All right. Maybe I'll do that.It's the only way I'll be able to learn English fast enough, I guess.
好吧，也许我能办得到。我想这是我能迅速学会英语的唯一方法。
烹饪
A：What are you cooking?
你正在做什么？
B：I’m making pizza.
我在做匹萨。
A：Yummy! Do you have all the ingredients you need?
真香啊！需要的全部调料你都有么？
unless的意思
B：I’ve got everything, unless you want salami on your pizza.
都准备好了，除非你要吃带意大利香肠的匹萨。
A：That would be good. I can run to the store and buy some. What other ingredients are you going to put on the pizza?
那太好了， 我可以去商店买一些， 你还需要其它调料么？
unless
B：Pizza sauce and cheese, of course. And then mushrooms, green peppers, onions, olives, and bacon.
当然还有匹萨沙司和乳酪，蘑菇，青椒，洋葱，橄榄核烤肉。
danci.911cha.com
A：Did you make the pizza crust or buy it from a store?
你是自己做匹萨卷还是从商店买？
B：I made it from scratch.
我自己做。
unless的意思
A：Was it difficult?
难么？
B：No, I just had to mix some flour, water, and a little yeast. It’s almost ready to come out of the oven.
不难，只不过把面粉、水和一些发酵粉。差不多要准备出炉了。
A：Do I have time to get the salami?
来得及去买意大利香肠么？
B：Yes, but be quick. I’ve just got to wash the vegetables and cut them into little pieces. And then we can add the tomato sauce and the toppings.
是，但要快，我正好洗了蔬菜并切碎，然后我们可以加点番茄沙司和装饰配料。
1.
1. 除非,如果不：VB: Visual Basic,编程语言 | unless: 除非,如果不 | resulting: 结果的
2. 如果不,除非：▲university 大学 | unless 如果不,除非 | unlike 不像,和. . . 不同
3. 如果不：rock=岩石; | unless=如果不; | point out=指出;
1. 除非；若不；除非在…的时候
You use unless to introduce the only circumstances in which an event you are mentioning will not take place or in which a statement you are making is not true.
e.g. Unless you are trying to lose weight to please yourself, it''s going to be tough to keep your motivation level high...
除非减肥是为了悦已，否则很难保持积极性。
e.g. We cannot understand disease unless we understand the person who has the disease...
若不了解患者我们就不能了解疾病。