In the main loop, you turn the LEDon with the line.
在主要循环中，利用下面这行代码打开LED。
2
A gallium nitride LEDon sapphire has a typical internal quantum efficiency of around 70%.
基于蓝宝石的氮化镓发光二极管的一般内量子效率约为70%。
3
So someone who wants to become, say, head of software engineering at a large company in ten years’ time can see what sort of jobs have ledon to such roles for others.