Grounds maintenance - recommendations for the maintenance of hard areas excluding sports surfaces 地面保养.坚硬区域保养推荐方法
2.
When you haven ' t climbed a varying degree of pitch and little obstacles in it some times you need a surge the get the traction so that the momentum carry you through the hard areas 有时候我们爬的坡度变化并不大，也没有太多的障碍物，这时候找到抓地力较好的硬质地面，这样会比较容易通过。
