custom
1.custom有时指“一种风俗”，有时统指“风俗”。例如：This is an old custom among the natives. 和Custom is sometimes considered as important as law.
2.说“关税”和“税务机关”该用复数形式customs。但custom(-)house（或custom house）比customs-house（或customs house）普通。在customs duty，customs laws，customs officer和customs official里习惯用复数形式。
3.custom clothes，custom suit，custom garment和custom tailoring里的custom都作“定制的”解，跟“现成的”（ready-made）相对，这样用法的custom是美国英语，相当于英国的bespoke。
