体积小、重量轻、基本不需要维修等优点。
Small volume, light weight, basic don't need maintenance, etc.
带角度的锌屋顶可以持续使用几十年且不需要维修。
Angled zinc roofs are intended to last for decades with little to no maintenance.
发光器件无需电池电源或任何其他形式的收费，绝不需要维修或维护。
The light emitting devices require no battery power or any other form of charging, and never need servicing or maintenance.
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