1. 无害的;（尤指对健康）不造成伤害的
Something that is harmless does not have any bad effects, especially on people's health.
e.g. Industry has been working at developing harmless substitutes for these gases...
该行业一直在努力开发一些可以替代这些气体的无害物质。
e.g. This experiment was harmless to the animals.
这个试验不会对动物造成伤害。