根据水的蒸发现象，人们知道液体在一定的条件下能变成气体。
From the evaporation of water, people know that liquids can turn into gases under certain conditions.
本文首先根据水热平衡原理，讨论了白洋淀对气温和湿度的影响。
According to the water and heat balance principle, this paper discussed the influence of the Baiyangdian Lake on the air temperature and humidity.
这是因为，根据水足迹网络，在加纳平均仅生产一公斤的巧克力就需要24，000升水。
This is because it takes, on average, 24,000 litres of water to produce just one kilogram of chocolate, according to the Water Footprint Network.
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