潮水下降时，水从大坝流出，再次带动涡轮机转动。
When the tide fall, water goes out through the dam, the turbines turn again.
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?
当烘焙的温度高至400度时，咖啡豆内的油脂会流出来。
During roasting, oil locked inside the beans begins to emerge at around 400 degrees.
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