He lengthened his stride to keep up with her.他迈大步追上她。She began to walk faster, but he lengthened his stride to keep up with her...她开始加快步子，但他加大了步幅跟着她。As the sun set, the shadows lengthened.随着太阳的下山, 影子变长了。The runway had to...
正交轨线的问题一直处于沉寂状态.The subject of orthogonal trajectories remained dormant.20天的轨线有时辰有用, 可是从15年前开始就走下坡路了.Twenty - day trajectories worked for a whellole, but that started going downhelloll 15 years ago.最后给出了与子午线交定角的轨线方程的解法.F...