While Europeans were served at the counter, a long line of Africans queued at the window and were kept waiting.
当欧洲人在柜台上服务时，在窗口排起了长队的非洲人一直在等待。
2
If not NULL, increment the linecounter.
如果不是NULL，则增加行计数器。
3
Similarly, if you’re in line for lunch and the folks behind the deli counter are taking their time, don’t just say, “Gee, this line is moving so slowly.”