如果你一定要呆在阳光下的话，就用你能买到的最有效的防晒霜。
If you must be in the sunlight, use the strongest sunscreen you can get.
这把她的魂都吓飞了，如果你一定要知道的话。而且我也被吓坏了。
It scared the hell out of her, if you must know. And me, too.
依我看，如果一定要说他像谁的话，他比较像他的父亲。
如果您一定要修改代码，那么这将是一场噩梦。
If you absolutely have to touch the code, expect it to be a nightmare.
如果我告诉你，你一定要发誓不能告诉任何人任何事。
If I tell you, you have to swear not to say anything to anyone.
如果你耳朵痛，一定要去看医生。
如果，万一有贼来，一定要叫！
If, by any chance, any thieves should come, be sure to bark!
如果你在河里或者湖里游泳，一定要弄清楚水面下有什么。
If you swim in a river or lake, be sure to investigate what is below the water surface.
路易斯·阿姆斯特朗说过，如果你一定要问，你将永远都不会知道答案。
Louis Armstrong said, if you've got to ask, you'll never know the answer.
一定要打电话来，如果你想谈这件事。
如果你有机会去看那场演出,一定要去–它太棒了。
If you get a chance to see the show, do go – it's brilliant.
妈妈，如果你爱我，就一定要照料好你自己。
如果你想别人注意到你，一定要让别人看得见你的成绩。
If you want people to take notice of you, you must make your accomplishments visible.
如果你一定要问，她可能没有。
如果唱片行业试图终止或改变这种下滑的情况，一定要提出新想法。
If the record industry is to halt or reverse its decline, something new is needed.
如果一定要做出决定，最好向可信赖的朋友或家人寻求帮助。
If you have to, ask a trusted friend or family member for help.
如果你一定要吃零食，每次吃完记得刷牙或者咀嚼无糖口香糖。
If you must snack, brush your teeth or chew sugarless gum afterward.
如果你是用蓝色的衣服去配蓝色的帽子，颜色上一定要很相近。
If pairing a blue suit with a blue hat, the colors must match fairly closely.
如果你在菜单上看到酸辣浓汤，那你一定要点。
如果你一定要用的话，就调到低火刚刚加热就好，不要时间太长。
一定要事先想好，如果设备不能用的话怎么办。
如果你一定要知道的话，我感觉糟透了。
如果你计划到美国旅行，一定要非常小心。
If you're planning a trip to the United States, be very careful.
如果您已经登录到了一个站点，在完成时一定要记住退出。
If you are authenticated (logged on) to a site, always logoff after you finish.
如果出现了这些问题，一定要第一时间去咨询医生。
Consult your doctor immediately if any of those problems arise.
倾听，评估，如果合适就说服——一定要遵循这个顺序。
Listen, evaluate, and persuade (if applicable). In that order.
一定要比自己挣的花的少，如果没有那么多钱，就不要行动。
Spend less than you earn, go without until you have the money.
一定要比自己挣的花的少，如果没有那么多钱，就不要行动。
Spend less than you earn, go without until you have the money.
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