碰碰运气；试一试；放手一搏；
eg：I think you can take a chance,我觉得你可以碰碰运气
take a chance on sth冒…风险
You really do not need to take a chance on that small things,你真的不需要为那点小事冒险。
If you donot take a chance,who knows what will happen.你不试试，谁知道会发生什么情况
take a chance
vt. 冒险
eg：It still seems to me you could take a chance .
我总觉得你们还是大可一试。
冒险
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