吸烟烟蒂对环境有害。

Smoking butts can be harmful to the environment.

这种农药对环境有害。

This pesticide is harmful to the environment.

有毒废物对环境有害。

Toxic wastes are harmful to the environment.

有些气体对环境有害。

Some gasses are harmful to the environment.

化石燃料对环境有害。

Fossil fuels are harmful to the environment.

一些气体对环境有害。

Some gases are harmful to the environment.

这些化学品对环境有害。

These chemicals are harmful to the environment.

汽车的废气对环境有害。

The exhaust gas from cars is harmful to the environment.

塑料袋的使用对环境有害。

The usg of plastic bags is harmful to the environment.

这些化学物质对环境有害。

These chemicals are harmful to the environment.