It's important to tighten up the wheels properly, otherwise they vibrate loose and fall off.
把车轮拧紧很重要，否则它们会振动而松脱。
A lot of teachers spend weeks playing catch up in the fall to make up for the summer drop.
很多老师在秋季学期花几个星期的时间补上暑假落下的功课。
The boy would then fall to the grass, get up, without looking back at his mother, run as fast as he could, again, still with a smile on his face, as if nothing had happened.
然后，小男孩摔倒在草地上，再爬起来，不回头看他的母亲，再一次以最快的速度跑起来。他的脸上仍然挂着微笑，好像什么也没发生过。
If it is displayed on such occasions, do not allow the flag to fall to the ground, but let it be carried high up in the air to form a feature of the ceremony.
如果在这种场合展示国旗，不要让国旗掉到地上，而是让它高高地悬在空中以构成仪式的特色。
This allows you to move freely, but it will hold you up if you fall.
这可以让你自由移动，但如果你摔倒了，它会把你托起来。
Soft music can help us fall asleep faster and wake up less during the night.
轻柔的音乐可以帮助我们更快入睡，夜间醒来更少。
It was several years before someone came up with the idea of removing the bottom of the basket and letting the ball fall through.
过了好几年，才有人想到要去掉篮筐底部，让球掉下去。
Afraid that in her unclear state of mind she might fall off the rock to her death, Grant climbed on all fours up a tight, narrow path by digging into the earth with his fingers and feet until he reached Paula.
担心她在神志不清的状态下会从岩石上掉下来摔死，格兰特手脚插入泥土，四肢并用地沿着一条狭窄的小路往上爬，一直爬到宝拉身边。
The latest prototypes from Japan are able to help the elderly to get out of bed or get up after a fall.
来自日本最近刚研发的原型机器人可以帮助老人起床或是跌倒后扶老人起来。
Last fall I stayed up all night in Colombo, Sri Lanka, writing the manuscript for the Working for Yourself guide.
去年秋天，我经常在斯里兰卡的科伦坡工作至深夜，书写个人指南的脚本。
Their results have particular resonance today: their model showed why unemployment would shoot up in a recession but fall much more slowly when a recovery began.
他们的成果放到今天尤其不同凡响，他们提出的模型解释了为何失业率在经济萧条时一飞冲天，在经济开始恢复时却下降缓慢得多。
We had clean energy on the formal agenda in the fall, and it may well come up again this coming fall.
在去年举行的秋季年会上，我们将清洁能源问题列入了正式议程，今年秋季很可能在此列入正式议程。
For such short exposures, the rear curtain starts to fall, covering up the sensor before the front curtain is even fully open.
在这样短的曝光下，后幕帘落下，在前幕帘完全打开前遮蔽感光元件。
When entrepreneurs grow up, however, they often fall into management mode and let their left-brain subordinates take over.
而当企业家不断上升进入管理层之后，他们的工作就被他们用左脑思考的下属接管了。
Most observers reckon the industry’s revenue could fall by up to a fifth in 2010 as the exceptional market conditions that followed the bail-outs have faded.
一些观察家称，随着市场环境在拯救行动后变得很好的情况开始衰减，这一行业（银行业）的收入在2010年可能会下降逾20%。
In classic economic theory, when the price goes up, revenues per item rise but sales fall.
按照经典经济学理论，如果价格上涨，单件商品的收入会增加，但销量会下降。
The compression of the programme leaves little fat and no chance to catch up if you fall behind.
整个项目的压缩，给你留下了很少的空闲时间。如果你落下了，就没有机会再追赶上去了。
Do you have vivid dreams or hallucinations as you fall asleep or wake up?
当你醒来或睡觉时有过栩栩如生的梦境或幻觉吗？
But what counts is how things look from the perspective of the children - whether they feel just as loved when they mess up or fall short.
但真正重要的是孩子们感受到的是什么样子—他们是否不管做对、做错或做得不够好都感受到了父母不变的关爱。
Republicans already counting the seats they will pick up this fall should keep in mind Obama has a big card yet to play.
共和党人已经开始盘算今年秋天将要拾回的席位了，但他们应牢记奥巴马还有一张大牌要打。
There’s no question that this zeal for deregulation set Britain up for a fall.
毫无疑问，这种对放松管制的巨大热情将英国送上了衰退的轨道。
As long as there is a steady supply of rising air, cloud droplets are buoyed up and can't fall.
只要有持续供应的上升气流，云朵中的小水滴就会漂浮着而不会降落。
Ordinarily, when unemployment shoots up wages do not tend to fall: they simply grow more slowly.
通常，失业率升高的时候薪水是不会下调的：薪水只是增长的更缓慢了。
Employers don't appreciate the extra night's hotel bill, but since you're giving up your weekend, they usually fall in line.
老板们当然不会想要多付一天的住宿费用，但是既然你愿意牺牲你的周末，他们常常也不会计较。
That’s why people who fall in love stay up all night talking and it feels really exciting.
阿隆博士说，“这就是为什么恋爱中的人会彻夜不眠的畅谈，那种感觉的确让人激动和亢奋。
That’s why people who fall in love stay up all night talking and it feels really exciting.
阿隆博士说，“这就是为什么恋爱中的人会彻夜不眠的畅谈，那种感觉的确让人激动和亢奋。
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