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start-up 创业公司
He used to be the CEO of a start-up，but it closed down.
他曾是某个创业公司的CEO，不过公司倒闭了。

start up one's own business 创业
Wang's dad started up his own business from nothing.
王的爸爸白手起家创的业。

get started 开始
Alright, let's get started.
好的，让我们开始吧。

start over 重新开始
Every time he fails, he'll start over.
他每次失败，都能从头再来。