根据美国劳工部的统计，截止到2015年5月，登记在册的校车司机有505560人。

According to the U.S. Department of Labor, in May 2015 there were 505,560 registered school bus drivers.

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负责失业人员的登记、调查、统计；

a.being responsible for registration, investigation and statistics of the unemployed;

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对于像世卫组织这样的卫生机构，民事登记系统是最为可靠的出生、死亡和死因统计数据来源。

For health agencies like WHO, civil registration systems are the most reliable source of statistics on births and deaths, and causes of death.

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