例句：

　　投資航空公司是非常冒險的生意。

　　Investing in airlines is a very risky business.

　　這不是冒險的時候，他知道他應(yīng)該按規(guī)則行事。

　　This was not the time to take risks; he knew he should play it by the rule book.

　　這是一項冒險的舉動，但也許能換得更多的時間。

　　It was a risky operation, but might buy more time.