一棵高大的树每天可以将100加仑的水从深埋地下的树根输送到树顶。
A tall tree can transport a hundred gallons of water a day from its roots deep underground to the treetop.
通常情况下,我们的发电机每天使用20加仑的燃料。
Our generators typically use more than 20 gallons of fuel a day.
纽约人每天制造十亿加仑的黑水。
New York City occupants produce one billion gallons of wastewater every day.
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