帮帮忙Accident 用英语如何来解释这个词?

老兄这样解释可就长了,很多都是一次多意,多词性的,我就按最常用的解释吧：Accident: Something, especially something unpleasant, undesirable, damaging, that happened unexpectedly or by chance。Pedestrian: A person traveling on foot; a walker。Going or performed on foot。Zebra：Any of several swift, wild, horselike African mammals of the genus Equus, having distinctive overall markings of alternating white and black or brown stripes。 Crossing:A place at which roads, lines, or tracks intersect; an intersection。Road:An open, generally public way for the passage of vehicles, people, and animals。Safety:The condition of being safe; freedom from danger, risk, or injury。Side:A surface of an object that extends more or less perpendicularly from an observer standing in front。Walk:To move over a surface by taking steps with the feet at a pace slower than a run。