分词翻译
事的英语翻译：
accident; affair; be engaged in; business; job; matter; responsibility; serve
thing; trouble; work故的英语翻译：
reason; cause; hence; therefore; die; former; old; friend; happening
on purpose预防的英语翻译：
prevent; provide against; take precautions against; obviate; preclude
precaution
【医】 prevention; prophylaxis; synteresis
