Like the proverbial canary in a coal mine, the nearly 10, 000 known bird species act as "environmental barometers" whose populations can appraise the greater well-being of their habitats.

就如谚语所说煤矿里的金丝雀一样，近10,000种已知的鸟类在自然界中扮演着“晴雨表”的角色，它们的数量可以用来评价其栖息地的健康情况。

youdao

Analyses and evaluations of the bird habitats: Environmental quality of the investigating sampling areas were evaluated by referring evaluation methods of developed countries.

鸟类栖息地分析与评估：参考国外栖息地评估方法，对调查样区环境状况进行了评估。

youdao

The aim of the RSPB are to campaign about environmental issues, protect, restore and manage endangered environments and to research bird life.

英国皇家保护鸟类协会的宗旨就是鼓动和参与有关环境问题的活动，保护，恢复和管理已经遭到危害的环境和研究鸟类的生存。

youdao

Even more surprising was the decision in February of the federal and Alberta governments to charge Syncrude, a large tar-sands processor, with offences under environmental and bird-protection laws for the deaths of 500 ducks in one of the company's tailing ponds last April.

ECONOMIST: Stephen Harper looks to Washington, not Alberta

No-till, practised more in America than in Britain, means growing crops without ploughing fields, and leads to many-fold increases in bird population and a range of other environmental benefits.

ECONOMIST: What the birds and bees say

This notion that women's natural role as homemakers and mothers gave them a responsibility to act as nature's housekeepers led many socially conservative women to take up environmental activism, campaigning to protect the nation's bird population, which was being decimated by the feather trade, and promoting conservation education in their children's schools.

CNN: When helping Earth was women's work