课程目录
课程概述
港口像是部分封闭的水面，水深较大，这一区域不受风或水波的影响。一般位于沿海或河口等地，以促进通航。
A harbor is a partially enclosed water surface with greater depth and this area is not effected by the action winds or waves. It is generally situated along sea shore or river estuary etc. to promote navigation through sea.