1、 Moreover,gallium arsenide is much more expensive than silicon in the first place.
另外，最重要的是，镓砷化物比硅贵得多。
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2、 The crystal layer on early LEDs was gallium arsenide or gallium phosphide, which lent that reddish color.
早期LED的液晶层是砷化镓或者磷化镓做的，所以发出红光。
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