24once the city's main water source, the Los Angeles River is now a concrete channel fed by storm drains.
曾经作为城市主要水源的洛杉矶河，现在是一条混凝土渠道，用于暴雨排水渠。
The South Passage which is little affects by the human being is the main channel of water discharge and sediment in the Changjiang Estuary.
南槽是长江口主要的水沙交换通道之一，受人类活动影响较小。
The frost heaving damage is main damage form of lining channel in north China, which is an integrative result of temperature, water content, soil characteristic and frost force.
渠道衬砌的冻胀破坏是温度、水分、土质和冻胀力等因素共同作用的结果，是北方地区渠道的主要破坏形式。
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