bear down什么意思解释？

The nurse will tell you when to bear down.分娩时护士会告诉你何时使劲收缩腹肌.I cannot bear to see bear bear down upon a hare.我忍受不了(自己)看着一只熊对一只野兔施压.He tried his best to bear down all of his oppositions.他尽全力击败一切反对意见....

bear down的音标：bear down的英式发音音标为：[bɛə daun]bear down的美式发音音标为：[bɛr daʊn]...