(n.) 礼节;礼仪
People should be careful about their traveling etiquette.
大家应该要注意旅行的礼仪。
customs 
(n.) 海关
Customs took away all the fruit that she had brought from Thailand.
海关把她从泰国买的水果都没收了。
easier said than done
说来容易做时难
It's easier said than done, and you should try some day yourself.
不是讲那么容易，有一天你试试例知道了。
