我叶海关和口岸的性质总是不能分得很清楚。根据字面解释，海关应该是检查进出国境的货物的，可是各色人等出国、回国，也必须得通过海关的检查。《辞海》给口岸下的定义是：“对外通商的港埠”。可有些口岸既不是港口也不是大城市，只有几间房子守着一条有栏杆的通道......于是 The nature of my leaf customs and ports can not always be clearly identified. According to the literal interpretation, the customs should check the goods going in and out of the country. However, if people of all kinds go abroad and return to China, they must also pass the inspection of the customs. “Cihai” to port under the definition is: “foreign trade port ”. But some ports are neither port nor big city, only a few houses guarding a railings ... ... so