在全世界，高达40%的感染是由不经消毒重复使用的注射器和针头引起的。在有的国家，这一比例竟高达70%。

Worldwide, up to 40% of injections are given with syringes and needles reused without sterilization and in some countries this proportion is as high as 70%.

youdao

首先，IQ的遗传特征竟然会随年龄的增长而表现得更明显，也就是说，随着人们年龄的增长，IQ的差异由遗传决定的程度竟逐渐提高。

One is that the heritability of IQ rises with age--that is to say, the extent to which genetics accounts for differences in IQ among individuals increases as people get older.

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一个简单的数据就能够给出解释：租一辆自驾车由洛杉矶去休斯顿的花费竟相当于起点和终点互换情况下的3倍。

One simple statistic tells that tale: it costs nearly three times as much to rent a self-drive van for a one-way journey from Los Angeles to Houston as the other way around.

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