douheBNC²³⁶²¹³⁺¹ 例句 The damage to Douhe River dam can be explained better by the results obtained, and it is found that sand gravel wells and sand gravel layers play an obvious role in drainage of the whole system. 得到的结果能较好地说明宏观破坏现象，同时也表明砂砾井和砂砾层有明显的排渗作用。 cgejournal