Definition: not able or not likely to cause harm Level: B2
大多数蘑菇是完全无害的，但有些是有毒的。
Most mushrooms are completely ___harmless, but some are poisonous.
总之，汽车并不像看起来那么无害，所以我们必须减少使用它们。
In conclusion, cars are not as ___harmless as they look, so we must stop using them so much.
这种化学物质对人类无害，但对昆虫有毒。
The chemical is ___harmless to humans but toxic to insects.
