例如，为何不让像拉各斯这样大城市的用水者交纳些额外费用以资助抽粪出坑呢？
Why, for instance, do water users in a megacity like Lagos not pay an extra charge to get cesspits pumped out?
其结构简单，适用范围广，相对成本较低，是国外同类产品的六分之一，是各牧场首选抽粪工具。
With simple structure, large scope of application and lower relative cost, they are 1/6 costs of the similar foreign products, making them become the first choice of all pastures' liquid manure pumps.
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