例句：
投资航空公司是非常冒险的生意。
Investing in airlines is a very risky business.
这不是冒险的`时候，他知道他应该按规则行事。
This was not the time to take risks; he knew he should play it by the rule book.
这是一项冒险的举动，但也许能换得更多的时间。
It was a risky operation, but might buy more time.
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