最简单也最普通就是在蓝色LED上罩一层黄色的磷。
The simplest and most common way is to coat a blue LED with a yellow phosphor.
上部装置——有上部机壳、上罩、卸料口(装有防回料板)、头轴装配、逆止器等部件。
Upper device — includes parts of upper casing, top cover, discharge outlet (with anti back feed plate), head shaft and backstop.
他已戴上氧气罩，旁边的便携式氧气罐就像一只忠诚的狗一样躺在地毯上。
He's got his oxygen on, and the portable tank next to him on the rug like a faithful dog.
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