╔______________________╗ 开始和结束只不过是一条线段的两端、有开始、亦会有结束。Open beginning and had not only is a bundle of the two lines, open, also can have╚─────────────────────────────────╝
╔______________________╗ 开始和结束只不过是一条线段的两端、有开始、亦会有结束。Open beginning and had not only is a bundle of the two lines, open, also can have╚─────────────────────────────────╝