后二复式组选技巧和方法简介：The train was clanging, the carriage was swaying, the dark scene outside the window was bright and dark for a while, and sometimes it would pass through a tunnel, and the endless wind whistled past him.
The train was clanging, the carriage was swaying, the dark scene outside the window was bright and dark for a while, and sometimes it would pass through a tunnel, and the endless wind whistled past him.
