If 5 square meters of forest evaporates about 4 tons of water a year, how many tons of water evaporates per square meter of forest in a year?
如果5平方米的森林一年大约蒸发4吨水，那么平均每平方米的森林一年大约蒸发多少吨水？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>