onset

n.攻击，着手

one-sidedly, one-sidedness, one-time, one-to-one, one-track mind, one-upmanship, one-way, onerous, oneself, ongoing, onion, online, onlooker, only, only that, only too, ono, onomatopoeia, onomatopoeic, onrush, onshore, onside, onslaught, onto, onto (also on to), ontological, ontology, onus, onward, onward(s), onyx, oodles, oomph, ooze, op, op (also Op), op art, op-ed, opacity, opague,