safety是不是可數(shù)名詞

　　Two casualties were airlifted to safety.

　　兩名傷亡人員已空運(yùn)到安全地區(qū)。

　　Firefighters led the survivors to safety.

　　消防隊(duì)員把幸存者帶到了安全的地方。

　　Safety standards have gone down the drain.

　　安全標(biāo)準(zhǔn)根本不管用了。