在当前因环境压力因素，马尔萨斯人口论向人们敲响警钟时，生育率的降低也不失为人们对全球人口走向担忧的一剂安抚剂。

At a time when Malthusian alarms are ringing because of environmental pressures, falling fertility may even provide a measure of reassurance about global population trends.

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投入愉快到前因素再怎么晚也不为过。

It's never too late to put the fun into the ex-factor.

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目的探讨影响肾移植术后发生急性排斥反应的相关术前因素，为预防移植肾急性排斥反应的发生提供临床依据。

Objective to explore the pre-transplant impact factors of acute rejection after kidney transplantation in order to provide clinical basis for the prevention of acute renal rejection.

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