公顷是面积的公制单位，等于一万平方米或100公亩，它也等于2.471英亩。
Hectare is a metric unit of area, equal to 10,000 square meters or 100 ares, which also equals 2.471 acres.
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).
每一个学生将计算得出吸收每个家庭成员由于能源使用而产生的二氧化碳所需的森林面积(单位：公顷)。
Each student is to calculate the forest area in hectares needed to absorb the carbon dioxide (CO2) each their family members produces when consuming energy.
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