a unit of area (4840 square yards) used in english-speaking countries.
面积单位用于使用英语的国家。
a unit of area defining the extent of a concession to explore for oil or gas offshore.
区块是限定勘探海上油气特许权的范围的一个面积单位。
past dynasties concerned how to increase a unit of area yield, in order to resolve the contradiction because of more people and less plough field in magnificent country.
历代统治者都非常关心如何提高粮食单产,以便解决泱泱大国人多地少的矛盾。
a unit of area equals to one foot by one foot square.
一种面积单位等于一英尺乘以一英尺。