1·Because we calculated here the requirement for just not slipping.
因为这里我们计算了,恰好不滑动的情形。
2·A yoga matcan be helpful because it cushionsa bit and keeps your feet from slipping.
瑜伽垫很有用，因为它起到一定的缓冲作用，并防止脚部滑动。
3·So then we have skidding and we have slipping and then we don't have the pure roll situation.
所以这里是滑移和滑动，而不是纯滚动的情况。
4·Dr Schuh's team found that chrome benefits from a crystalline structure that is exceptionally small and this prevents its atomic rows from slipping.
Schuh博士的小组发现铬是得益于一种结晶质结构，这种结构微小，因此防止了原子行的滑动。
5·The helmet should protect the forehead without slipping forwards or backwards; it should not move unless the head moves.
头盔应该不偏向前后而保护前额；至少头部转到时头盔不应滑动。