如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。
If headaches only occur at night, lack of fresh air and oxygen is often the cause.
如果土拨鼠会扔木头，一只土拨鼠能扔多少木头?
How much wood would a woodchuck chuck if a woodchuck could chuck wood?
就像只鸵鸟一样，她以为如果她看不见我，那么我就不存在。
Like an ostrich, she thought that if she couldn't see me, then I don't exist.
如果它像鸭子一样走路，像鸭子一样呱呱叫，那它一定是一只鸭子。
If it walks like a duck and quacks like a duck, it must be a duck.
如果你可以只在需要的地方喷洒化学药品，为什么要在整个田地里喷洒呢？
Why dose a whole field with chemicals if you can spray only where they are needed?
一个有关食物的都市神话声称，如果食物只在地上停留几秒钟，灰尘和细菌就不太有可能污染它。
An urban food myth contends that if food spends just a few seconds on the floor, dirt and germs won't have much of a chance to contaminate it.
正如维多利亚时代的人所理解的那样，如果你想改变你的生活，不要只寻找一个聪明的线索。
As the Victorians understood, if you want to change your life, don't just look for a clever cue.
如果你只是想要一只小宠物，豚鼠是一个很好的选择。
If you want a small pet that you can actually pet, a guinea pig is a good choice.
如果一只蚂蚁找到了一个出色的洞穴——比如橡子或岩石裂缝的内部——它就会叫来另一只侦察蚁对洞穴进行检查。
If an ant finds an outstanding hole—such as the inside of an acorn or a rock crevice—it recruits another scout to check it out.
这些结果表明，如果一个企业想要成功，它应该只雇佣每晚睡眠时间少于6小时的人。
These results suggest that if a business wants to prosper, it should hire only people who need less than 6 hours of sleep per night.
有时一个市场商人会把一只猫放在他的包里，假装它是一只猪来愚弄顾客！所以如果有人让猫从包里出来，秘密就会为我们所知。
Sometimes a market trader would put a cat in his bag and pretend it was a pig to fool the customer! So if someone lets the cat out of the bag, the secret would be open to us.
如果所绘制的水平线与一个多边形顶点对齐，那么只计算位于该线下方的部分。
If the horizontal line drawn is aligned with a polygon vertex, then only the segments that are below the line are counted.
这是一个只输无赢的情形。如果她假装讨厌内德，她会觉得痛苦；而如果她承认喜欢他，她会感觉更难受!
It was a no-win situation. Either she pretended she hated Ned and felt awful or admitted she loved him and felt even worse!
“如果我能心想事成”，莎伦沉思自语道，“我想只工作半天。”
"If I could have just what I wanted," Sharon mused, "I'd work half days."
“如果我有一只乌鸦或狐狸幼崽，我就可以和它玩。”玛丽说。
"If I had a raven or a fox cub I could play with it," said Mary.
“啊，如果你是这个意思的话，我们还没有走呢。”第一只燕子回答说。
"O, we're not off yet, if that's what you mean," replied the first swallow.
如果一只鸟静静的坐着，而不是收集神已经给他们提供食物，他们就会饿死。
If a bird sits still, instead of gathering the food God has provided for them, they will starve.
如果你是一只画眉鸟，向我展示你的窝在哪儿，你以为我会告诉别人吗？
If tha' was a missel thrush an' showed me where thy nest was, does tha' think I'd tell anyone?
如果你是一只鹰，你想要的是猛扑下来抓住松鼠，并且不被它抓伤脸。
If you're a hawk, you want to swoop down on a squirrel and not get scratched in the face.
如果你不能成为一只铅笔，书写别人的快乐，那就尽力成为一块橡皮，抹去别人的悲伤。
If you can't be a pencil to write anyone's happiness, try to be a nice eraser to remove someone's sadness.
如果一只债券在利率较低的时候发行，在现行汇率为6%的的时候，它的票面利率可能为4%。
If a bond was issued when interest rates were lower, they might have a 4% coupon when the prevailing rate is 6%.
在欧洲有一个传统，如果一只鸽子飞在房子周围，而那里的人正在死去，那么他们的灵魂将得到安息。
There was a tradition in Europe that if a dove flew around a house where someone was dying then their soul would be at peace.
使用上面的示例，如果想只使用羊驼地图生成输出，会发生什么情况呢？
Working with the sample above, what happens when you want to produce output using only the alpaca map?
他说：“如果有九只兔子，集中精力抓一只，不要试图把它们全部抓住。”
"If there are nine rabbits, focus on catching one, don't try to catch them all," he said.
如果我们只种植那种植物，我们只需投入少量的能量，并且植物仍然可以良好地生长。
If we cultivate just that kind of plant, we only put tiny amounts of energy in and the plants still grow nicely.
如果把一只大黄蜂丢进一只敞口平底玻璃杯里，不把它拿出来，它会在那儿一直呆到死。
A bumblebee, if dropped into an open tumbler, will be there until it dies, unless it is taken out.
如果有什么打扰到他的话，他会像一只愤怒的猫一样挥舞他卷起来的尾巴。
When anything annoys him, He swings the horror of his folded tail like an angry cat.
蜘蛛有8只眼睛，4对腿，如果它们失去一条腿，还能再长出一条新的腿。
Spiders have eight eyes, four pairs of legs, and can grow a new leg if they lose one.
如果我变成其他动物，我愿意做一只快乐的小云雀！
Could I exchange my nature with any other creature, I fain would be such a happy little lark!
如果我变成其他动物，我愿意做一只快乐的小云雀！
Could I exchange my nature with any other creature, I fain would be such a happy little lark!
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