sentences: a germ is a kind of harmful substance
docs: alcohol is biochemically_harmful_substance. hydrogen_fluoride is biochemically_harmful_substance. toxic_substance is biochemically_harmful_substance. aerosol is biochemically_harmful_substance. infectious_particle is biochemically_harmful_substance. germ is microorganism. biochemically_harmful_substance is dangerous_thing. substance_p is chemically_harmful_substance. chemically_harmful_substance is biochemically_harmful_substance. radioactive_substance is biochemically_harmful_substance.