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(xiàng)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.