There are fears that he will not be able to keep it up when he gets to the particularly demanding third year.
有人担心到了极其艰难的第3年他会坚持不下去的。
What's going to hold this ribbon up and keep it reach enough to support an elevator car?
要用什么来让这条带保持向上，并让它足够支撑一个电梯轿厢呢？
"Not at first, perhaps," said the Hatter, "but you could keep it to half-past one as long as you liked."
“也许一开始没有，”帽商说，“不过你想要多久就可以把时间保持到一点半。”
Someday we may be able to take any cell and keep it alive functioning and reproducing itself essentially forever through the use of telomerase.
总有一天，我们也许能够利用端粒酶使任何细胞保持活力，使其正常工作并永久地自我复制。
If you're telling lies, keep it simple—never over-egg the pudding.
如果撒谎，措辞要简短；千万别画蛇添足。
The house only needs an occasional coat of paint to keep it shipshape.
房子只需偶尔粉刷一次就可以保持其良好状态。
They had advised us to keep it a secret, but we wanted it out in the open.
他们曾建议我们对其保密，但我们却想将它公之于众。
Huge fans will have to cool the concrete floor to keep it below 150 degrees.
为了让水泥地温度一直低于150度，必须用巨大的风扇来降温。
I consider you a good friend, and if it's all right with you, I'd like to keep it that way.
我把你看成一个好朋友，如果你认为可以的话，我想继续保持这样。
While there is still sufficient trapped air within the container to keep it buoyant, it will float.
只要容器中仍然有足够的空气使它能浮起，它就能漂浮。
Why do you still want to keep it?
为什么你还想保留它？
I would keep it for myself forever.
我会永远留着它。
He said he would certainly keep it.
他说一定会留着它。
No one will know if we keep it secret.
如果我们不说，不会有人知道的。
Tha' won't have to keep it up much longer.
这种情况不会持续太久。
Let's keep it secret and give her a surprise.
让我们保守秘密，给她一个惊喜。
You can keep it in the Animal Centre next door.
你可以把它放在隔壁的动物中心。
I told her she didn't need to keep it a secret from me.
我告诉她不需要对我保密。
The cat looked so cute that the children begged to keep it.
这只猫看起来非常可爱，孩子们都求着要养它。
Sometimes to take the lead is easy, but to keep it is hard.
有时候，领先很容易，但要保持领先就很难了。
It's very interesting, but you can only keep it for two weeks.
这本书很有趣，但是你只能借两个星期。
They built the library under the ground to keep it safe from bombing.
他们把图书馆建在地下以保护它不受轰炸。
Modern Chinese Art itself needs new works to keep it alive and moving forward.
中国现代艺术本身也需要新的作品来保持其活力，保证其不断前进。
This will help you keep it in mind longer, especially when memorizing formulas or facts.
这将帮助你在脑海中更长时间地记住它，尤其是在记忆公式或事实的时候。
Instead of throwing away a wrapper after you indulge in something sweet, keep it in a jar.
在你纵情享受甜食后，不要扔掉包装纸，而是保存在一个广口瓶里。
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