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The principal thing in this world is to keep one s soul aloft. 人生在世首要大事是保持灵魂的高尚。
keep one's tools bright 常备不懈
The gardener' s tools are kept in the shed. 花匠的工具放在小屋里。
The farmer keeps one ram and five ewes on his farm. 农夫在农场里养了一只公羊，五只母羊。
To set a fox to keep one's geese. 如狼牧羊。
It's dangerous to set a fox to keep one's geese. 引狼入室是非常危险的。
Keep one's reputation free from. 使自己的名誉不受损害。
Once one does a thing, one must keep one's hand in. 干一项,总该专心一项。
Keep one's account open at a bank. 在银行开有户头
To attempt to keep one's courage up. 给自己壮胆试图鼓起某人的勇气
A wom an can keep one secret of her age. 女人能守住一个秘密：自己的年龄。
A borrowed cloak does not keep one warm. 借来的大氅不暖身。
The best way to keep one's word is not to give it. 信守诺言的最好方法是不许诺言!
He opened it and looked fondly at the finest set of burglar‘s tools in the East. 他将它打开之后，爱惜地瞧着那套在东部最出色的盗窃工具。
One should keep one's reputation free from all slurs. 人应该保持名誉不受责备。
Not knowing much Italian, it was all the teacher could do to keep one step ahead of the class. 因不太懂意大利语，老师只能做到比全班水平稍高一点。
In the light of the character of the objective function and the constraint condition, elect the reasonable optimal design’s tools and raddle program. 根据目标函数的性质和约束条件，选用合理的优化设计方法，编制程序。
The frozen snow was so slippery that is was hard t keep one's feet. 冰雪溜滑，人们很难站稳。
It is difficult to keep one's balance on an icy pavement. 人行道上结了冰，要想不倒可不容易。
It's no easy job to keep one's career apart from one's family. 把一个人的事业与其家庭分开不是件容易的事。