risk是可數(shù)名詞嗎

　　Any investment involves an element of risk.

　　任何投資都有一定的風(fēng)險(xiǎn)。

　　Hundreds of thousands of people are at risk.

　　有幾十萬人正處于危險(xiǎn)中。

　　It seems only right to warn you of the risk.

　　似乎應(yīng)該警告你有風(fēng)險(xiǎn)。