B2 not able or not likely to cause harm无害的,不会导致损伤的
More examples
They say that exposure to low level radioactivity is harmless.
These normally harmless substances combine to form a highly poisonous gas.
Those who think this is a harmless recreational drug are being naive.
For a long time, tobacco was thought to be a harmless.
They weren't having an affair - it was a harmless flirtation and nothing more.
adjective
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