safety是不是可數名詞

　　Two casualties were airlifted to safety.

　　兩名傷亡人員已空運到安全地區。

　　Firefighters led the survivors to safety.

　　消防隊員把幸存者帶到了安全的地方。

　　Safety standards have gone down the drain.

　　安全標準根本不管用了。