custom作為風俗是可數嗎

　　This particular custom has its origins in Wales.

　　這一特殊風俗起源于威爾士。

　　It was his custom to approach every problem cautiously.

　　謹慎地處理每個問題是他的習慣。

　　The custom of lighting the Olympic flame goes back centuries.

　　點燃奧運圣火的風俗可追溯到幾個世紀前。