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.
高稳定的激光可以产生极细的齿，这样可以非常精确的测量特定的频率或频率变化。
A highly stabilized laser produces very fine teeth, enabling highly precise measurements of specific frequencies or changes in frequency.
至于儿童，肥胖率在过去十年没有什么变化，除了极重男童的数量罗有增加。
Among children, too, there was no change in obesity rates except among the very heaviest boys, whose Numbers increased slightly.
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