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水库由于泄洪、灌溉、发电等的需要,经常排水,特别在洪水季节,为使大坝安全,输水涵洞和溢洪道(闸)更需大量排
Due to the need of flood discharge, irrigation and power generation, reservoirs are often drained. Especially during the flood season, large numbers of drainage culverts and spillways