protect the environment 保护环境
1) protect 保护 可以不跟 from 或 against, 例如，
My prime concern is to protect my property.
我最关心的是保护我的财产。
We have a moral obligation to protect the environment.
我们有道义责任保护环境。
2) protect 保护 跟 from, 表示 保护…免受…之害，from 来自，例如，
The walls were strengthened to protect them from collapse.
围墙已加固以防倒塌。
The body has natural defence mechanisms to protect it from disease.
人体对疾病具有天然的防御机制。
3) protect 保护 跟 against, 表示 防止，防御，against 以防，制止，阻止，例如，
Exercise will not only lower blood pressure but possibly protect against heart attacks.
运动不仅会降低血压，而且能防止心脏病发作。
The bags have tough exterior materials to protect against knocks, rain, and dust.
这些袋子结实的外层材料有防撞、防雨、防尘的作用。
