Natural runoff variety and current forecasting researches are very useful for terrestrial water cycling and water balance research and water resources management.

河川天然径流量变化与趋势预测研究对陆地水循环与水量平衡研究和水资源利用等均有重要意义。

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When this happens, billions of years from now, the terrestrial month will be longer — about 40 of our current days — because during all this time the Moon will continue moving away from us.

这种情形发生的时候，已是距今几十亿年以后的事了，陆地上的一个月会变得更长——大约是现在的40天——因为在此期间月球将持续远离我们。

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When this happens, billions of years from now, the terrestrial month will be longer — about 40 of our current days — because during all this time the Moon will continue moving away from us.

这种情形发生的时候，已是距今几十亿年以后的事了，陆地上的一个月会变得更长——约是现在的40天——因为在此期间月球将持续远离我们。

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