harmful

Exposure to harmful ultraviolet rays from the sun can lead to skin damage if you don't wear sunscreen.

(Chinese) 如果不涂防晒霜，暴露在太阳有害的紫外线下会导致皮肤受损。

Dumping chemical waste into the river has a harmful effect on the local fish population.

(Chinese) 将化学废物排入河中对当地的鱼群有负面影响。