This particular custom has its origins in Wales.

　　這一特殊風(fēng)俗起源于威爾士。

　　It was his custom to approach every problem cautiously.

　　謹(jǐn)慎地處理每個(gè)問題是他的習(xí)慣。

　　The custom of lighting the Olympic flame goes back centuries.

　　點(diǎn)燃奧運(yùn)圣火的風(fēng)俗可追溯到幾個(gè)世紀(jì)前。