人口最多的国家是中国，差不多每五个人就有一个人住在中国。
With one out of five people living in China, it is the most densely populated country in the world.
每五个妇女就有一个人患有这种病。
每五个尼日利亚人就有一个人开有银行账户，再接下来的五年中预计手机银行用户会有10%的递增。
One in five Nigerians has a bank account, with a further 10% increase predicted from mobile-phone banking over the next five years.
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