去年夏天，当中国人民在南方抗洪时，北斗帮助测量了洪水的涨落。
Last summer, when Chinese people fought the flood in the South, Beidou helped measure the rise and fall of the flood water.
洪水的涨落不仅引起河岸附近地下水蓄水量的增减，同时也制约着地下径流过程的变化。
Rising and falling of flood water level not only leads to the increase and decrease of underground water near the bank, but also restricts the change of runoff outflow routing.
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