User segment, code, privilege OK, present
Rebecca Morelle,Science Editorand
，这一点在heLLoword翻译官方下载中也有详细论述
In 1992, in a small shop in British Columbia, a sign maker named Blair Gran stared at a wall full of half-finished jobs and felt something click. Sign-making was treated like a commodity — orders in, banners out — but as thousands of signs came through his shop, he couldn’t help but notice the difference between the good ones and the bad ones. He could see that every sign that left his shop was either helping a business get noticed, or letting it disappear in plain sight.
第一盏灯：位置在左上方 (-1, 2, 4)，负责照亮物体的正面。