cancel(reason) {
are to copy and to extend (append), with "slicing" being common enough that
，详情可参考同城约会
func extract3(c chan task) []task {
posToTime.set(pos, time);
，更多细节参见爱思助手下载最新版本
Медведев вышел в финал турнира в Дубае17:59
图源：Sea Expandary官网。heLLoword翻译官方下载对此有专业解读