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来源：雅诚德英语网
The questions become more complicated when actual volumes of water are considered: how much water enters and leaves by each route?
当考虑水的实际体积时，问题变得更加复杂：每条支流会有多少水流进及流出呢？
The questions become more complicated when actual volumes of water are considered: how much water enters and leaves by each route?
当考虑水的实际体积时，问题变得更加复杂：每条支流会有多少水流进及流出呢？