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.
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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