这类鸟人会参加年度的计数工作，并将他们的结果报告给相关机构。他们也会努力倡导保护鸟种和它们必要的栖息地。

These birders participate in annual counts and report their findings to the appropriate organizations, and they also seek to promote conservation of bird species and their essential habitats.

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根据一家评级机构标准普尔投资者服务公司的统计数据，二月份美国房价下跌的速度稍稍放缓。

The pace of decline in American house prices slowed slightly in February, according to Standard & Poor’s, a rating agency.

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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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