不断变化的建筑规范、人们逐渐发展的品味，以及维护这些精美的旧标志牌的高昂成本，让企业欣然接受了发光二极管。它们节约能源，但成本仍然很高。
Changing building codes, evolving tastes, and the high cost of maintaining those wonderful old signs have businesses embracing LEDs, which are energy efficient but still carry great cost.
降低测试的规模以及维护时间。
妇女们学着如何建成以及维护一些太阳能灯和充电器。
The women learn to build and maintain a variety of solar-powered lamps and chargers.
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