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drop out of退出,辍学,脱离
例句：She dropped out of school to become a waitress.
她退学去当女侍应生。
2.Talks broke down over pensions and work roles, and transit officials say their offer was competitive.
break down损坏, 发生故障
例句：Our car broke down and we had to draw it to a garage.
我们的车坏了, 不得不把它拖到修车厂去。
Her telephone had broken down.
她的电话故障了。