acre [ˈeɪkə(r)]

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n.英亩，耕地；大量

a unit for measuring area , equal to 4047 square metres or 4840 square yards

The playground covers over an acre in extent. 操场的面积超过一英亩。
They measured off a half-acre plot for a house lot. 他们划出一块半英亩的地皮来作房屋地基。