The plant will soon choke ponds and waterways if left unchecked. 如不控制這種植物的生長，池塘和水道很快就要被阻塞。
By creating this pond, they are preventing soil from being washed away, and they are creating a place where new plants and insects can flourish. 通過建造這個池塘，他們可防止土壤被沖走，而且建造了一個新的植物和昆蟲能夠繁榮成長的地方。
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