人类一生中没有突然停止生殖机能，即形成绝经期或更年期的确切年龄。
There is. no definite age at which reproductive functions cease abruptly during life, constituting menopause or climacteric in man.
对于为什么树线以上的树木会突然停止生长，至今还没有一个公认的解释。
There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.
然而，如果房子停止升值，它突然就变得一点用没有了。
And if it stops appreciating, suddenly it’s not going to work anymore.
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