法国一种丈量土地的单位，尤指用于加拿大部分地区和美国南部的测量单位，约等于0.4公顷(0.85英亩)。
Any of various French units of land measurement, especially one used in parts of Canada and the southern United States and equal to about 0.4 hectare (0.85 acre).
知道天文单位和光年是用来丈量天体之间距离的单位。
Know astronomical unit and light year are used for expressing the distance between celestial bodies.
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