在这种历史背景下，不少国家开始采取各种法律和政策手段，保护自然环境和维护生态平衡。

Under this background, a lot of countries have carried out various kinds of measures to protect the environment and safeguard the balance of ecology.

youdao

在这种历史背景下，不少国家开始采取各种法律和政策手段，保护自然环境和维护生态平衡。

Under this background, a lot of countries have carried out various kinds of measures to protect the environment and safeguard the balance of ecology.

youdao