If the organic material decays or is oxidized, it will not form petroleum.
如果有机物腐烂或氧化，它不会形成石油。
If you suspect a gas leak, do not strike a match or even turn on an electric light.
假如你怀疑有煤气泄漏，不要划火柴，甚至连电灯都不要开。
What difference will it make if he knows or not?
他知不知道有什么关系吗？
If you'd like to recognize the greenness of an individual or organization, why not nominate them for an Environmental Achievement Award.
如果你想赞扬某个人或团体的绿色环保行为，何不将他们提名为环境成就奖的候选人？
I don't know if he's telling the truth or not.
我不知道他是否说了真话。
I wonder if I should wear a coat or not.
我不知道该不该穿外套。
If someone uses your credit card fraudulently, it's the issuer or merchant, not you, that takes the hit．
如果有人欺诈使用了你的信用卡，受打击的不是你，而是信用卡发行机构或商家。
If the gerbil's spouse dies, it may or may not accept a new spouse.
如果沙鼠的配偶死去，它可能会也可能不会接受一个新的配偶。
If you have a cold or flu, you'd better not pass it on to anyone else.
如果你得了感冒或流感，最好不要把它传染给别人。
Don't worry if you are not sure where you're headed or what your long-term goals are.
如果你不确定你的目标是什么，或者你的长期目标是什么，不要担心。
If someone uses your credit card fraudulently, it's the issuer or merchant, not you, that takes the hit.
如果有人用你的信用卡诈骗，受打击的不是你，而是信用卡发行机构或商家。
If you do so, they will use your website or app not because they have to but because they want to.
如果你这样做，他们会使用你的网站或应用程序，不是因为他们必须这样做，而是因为他们想这样做。
If your braided hair has loosened, if the parting of your hair be not straight, or if the ribbons of your bodice be not fastened, do not mind.
如果你的发辫若已松开，你的发缝若不平直，你的腰线若未系紧，你也不必介意。
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