She was unable to keep back her tears.
她无法忍住泪水。
Why do they keep passing back to the goalie?
他们为什么总是把球回传给守门员？
If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.
而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。
I will give you some land and the old house in the back of the ranch if you keep the horse there.
如果你让这匹马在那儿，我将把一些土地和牧场后边的那座老房子给你。
Do go back and keep an eye on the children.
回去看看孩子们。
Barricades were erected to keep back the crowds.
设置了障碍，使人群无法靠近。
I keep thinking back to the day I arrived here.
我不断回想起刚到这儿那一天的情景。
They keep chickens in the back yard.
他们在后院养鸡。
You can't keep using your bad back as an excuse.
你不能老拿腰疼当托词呀。
Police had to erect barriers to keep crowds back.
警察只得设立路障来阻截人群。
It is true in life that if we just keep going forward without looking back, we are more likely to reach our goals.
在生活中，如果我们只是勇往直前而不回头，我们更有可能实现我们的目标。
To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.
为了保持在水中不至于沉底，尾部的顶端比底端向后延伸，沿着后端形成一个斜面，产生提力。
For men, one of the best places to keep a wallet is in the back pocket of tight trousers.
对于男性来说，存放钱包的最佳位置之一是紧身裤后面的口袋。
Keep back straight and bend knees.
背要直，只弯两膝。
Keep back, lady, no one is going to catch me and make me a man.
退后，太太，没人会抓住我，把我变成男人的。
They believe that the best we can do is keep it at a reasonable level, and at present the only serious option for doing this is cutting back on our carbon emissions.
他们认为，我们所能做的最好的事情就是把它控制在一个合理的水平，而在这方面目前唯一重要的选择就是减少碳排放。
Identify the kinds of interests they keep coming back to, as these offer clues to the careers that will fit them best.
要确定他们能够坚持的兴趣爱好，因为这些爱好暗示了什么样的职业最适合他们。
To keep the astronauts and the spacecraft safe, the astronauts must leave and go back to the spacecraft through a special door.
为了保证宇航员和飞船的安全，宇航员必须通过一扇特殊的门离开和返回飞船。
Tom saw his opportunity, "Lookyhere, Huck, being rich ain't going to keep me back from turning robber."
汤姆看到了他机会，说：“喂，哈克，有钱也阻止不了我当强盗。”
He was moving back and forth to keep warm and asking for change very softly.
他来回走动取暖，轻声地要些零钱。
Even today when Will thinks that he won't be able to do something, he will look back to this experience and keep telling himself, "one brick at a time".
即使在今天，当威尔认为自己做不到一件事时，他会回顾这段经历，并不断告诉自己：“一次添一块砖”。
My mother was so touched by her gesture that she decided to go back to the store and give the cashier a five-dollar bill to keep on hand in case the same happened to someone else if they didn't have enough money for all of their groceries.
我母亲被她的举动感动了，她决定回到店里，给收银员一张五美元的钞票，让他放在手边，以防别人在没有足够的钱支付所购买的东西时发生同样的情况。
But the fire could not keep back the policemen.
但火焰不能阻挡警察们的步伐。
Martin shook his head, but he had failed to keep back the wolfish, hungry look that leapt into his eyes at the suggestion of dinner.
马丁摇摇头，但是他听见吃饭时眼里所流露出的饿狼般的馋相，却无法掩饰。
At the same time, watch any vehicles in front of you on the ramp and keep back a safe distance.
同时，注意观察你前方同在匝道上驶行车辆并保持安全的距离。
So, you will keep back the tears, because I believe that a happy ending.
所以，巨蟹会忍住泪水，因为相信着美好的结局。
She struggled to keep back her tears.
她努力地忍住泪水。
She struggled to keep back her tears.
她努力地忍住泪水。
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