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1·She was unable to keep back her tears.

她无法忍住泪水。《牛津词典》

2·Barricades were erected to keep back the crowds.

设置了障碍，使人群无法靠近。《牛津词典》

3·Keep back straight and bend knees.

背要直，只弯两膝。

4·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。

5·The fireman told me to keep back.

消防队员要我站远点。

6·I will keep back you make trouble.

我将阻止你惹麻烦。

7·She struggled to keep back her tears.

她努力地忍住泪水。

8·She tried to keep back her indignation.

她试图抑制住她的愤怒。

9·But the fire could not keep back the policemen.

但火焰不能阻挡警察们的步伐。

10·To keep back, as for future use or for a special purpose.

保留，收藏：保留，如用于将来使用或某一特殊的目的。