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Birth rates are notoriously difficult to predict.是什么意思？

Birth rates are notoriously difficult to predict.

众所周知，出生率是很难预测的。

相关词汇
birth rates are notoriously difficult to predict

birth

n. 出生，分娩，起源，出身；

rates

n. 速度( rate的名词复数 )，比率，等级，（利息等的）费率；v. 估价( rate的第三人称单数 )，值得，责骂，定级；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

notoriously

adv. 恶名昭彰地，声名狼藉地，著名地，众所周知地；

difficult

adj. 困难的，难做的，难解的，不易相处的；

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

predict

vt. 预言，预测，预示，预告；vi. 预言，预示：预言某事，预言；
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