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.
听着，如果你和伊丽莎白讲话或什么的，一定要让每个人都知道，你能做到吧。
Listen, if you talk to Elizabeth or anything make sure you let everyone know, will you.
依我看，如果一定要说他像谁的话，他比较像他的父亲。
如果你一定要抽烟，请选择吸烟区第一排的座位。
If you must have a cigarette, choose a seat in the first row of the smoking section.
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.
你可以在烹饪之前先将海鲜解冻，但是如果你这样做的话，一定要尽快地把它煮熟。
You can thaw out the seafood before cooking it, but if you do this, make sure you cook it as quick as you can.
他父亲一定要见到她，我一遍遍地发誓，如果那个魔鬼想阻止这个，即使让他死在他自己的门阶前也成！
Her father shall see her, I vowed, and vowed again, if that devil is killed on his own doorstones in trying to prevent it!
如果你一定要油炸，一定要把食物放在厨房的纸上，翻动几次尽量把油吸干。
If you must deep fry, be sure to drain the food on kitchen paper, turning it a few times to drain off as much oil as possible.
当然，那里也有以前最受欢迎的景点，如水族馆和鳄鱼洞，但如果你不够时间参观所有的景点，请一定要去海龟镇。
Of course, there are the old favourites like the Aquarium and the Crocodile Cave, but if you don't have time to see everything, make sure you visit Turtle Town.
躺在床的边沿，摇摇欲坠，如果你一定要的话，可以发火，但要躺在同一张床上。
Lie precariously at the edge of the mattress and fume if you must, but lie in the same bed.
如果一定要来，我们至少要成双成对地来；那我们基本上就没事了。
If we have to come, we come in couples, at least; then we're generally all right.
如果你想去上1点的课，你可以这样做，但是一定要和我的助教安排一下。
If you want to go to class at 1:00, you're welcome to do so, but please arrange it with my assistants.
如果你在户外生火或烧烤，一定要小心，离开前一定要确保炉灰是冷的。
Be careful if you have an outdoor fire or barbecue — make sure ashes are cold before leaving.
如果你在旅行时喜欢住便宜的旅馆，一定要确保你能从里面锁上房间的门。
If you prefer to stay in cheap hotels while travelling, make sure you can lock the door of your room from the inside.
如果你耳朵痛，一定要去看医生。
如果Hiccup 冒着危险去和这条龙做朋友，那它一定要是世界上最可怕的巨龙。
If Hiccup was going to take a risk and befriend a dragon, it had to be the most frightening dragon in the world.
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。
如果开了镇静剂，一定要让医生告诉你它可能带来的副作用，例如上瘾。
If a tranquilizer is prescribed, be sure your physician informs you of its possible side effects, such as addiction.
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.
如果你有机会，一定要去奥克兰博物馆，因为那里有最后一个幸存的“鸟人”风筝展览。
If you have a chance, do visit the Auckland Museum because they have the last surviving "birdman" kite on display.
如果你在苛刻的批评、嘲笑和焦躁下成长，那么一定要称赞、疼爱并耐心地对待你的孩子。
If you grew up with harsh criticism and ridicule and impatience, then be sure to compliment, love, and exercise patience with your children.
如果使用便携式厕所，一定要把你的厕所垃圾扔到适当的垃圾站。
If using a portable toilet, always throw away your toilet waste at a proper waste station.
塑料袋每年会导致10万只海洋动物死亡，因为这些动物误以为它们是食物。所以如果你必须使用它们，一定要回收它们。
Plastic bags cause the deaths of 100,000 marine animals each year because the animals mistake them for food. So if you must use them, always recycle them.
如果你一定要去踢足球，至少要等到放学。
If you must go and play football, at least wait until school is over.
如果你去北京，一定要参观中国科技馆。
If you go to Beijing, make sure you visit China Science and Technology Museum.
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