钢和吕伯槽是最常见地室第系统中运用地资料。
Steel and aluminum gutters are the most common materials used in residential systems.
在该州北部的沙岗地区、吕伯的牧场附近，含水层尤其接近地表。
The aquifer rises especially close to the surface in the Sand Hills region in the north of the state, near Mrs Luebbe's ranch.
镀锌钢水槽是最经济地选择，并强于吕伯槽，但他们最终可能生锈。
Galvanized steel gutters are the most economical choice and are stronger than aluminum gutters, but they may eventually rust.
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