outer cover的用法和样例：
例句
- The invention can conveniently dilate the outer tyre by matching the first pulling buckle with the second pulling buckle.
本发明通过第一拉扣与第二拉扣的配合，可以很方便地对轮胎外胎进行扩张。 - The invention discloses an outer tyre dilator of a tyre, and solves the dilatation problem of the outer tyre.
本发明公开了一种轮胎外胎扩张器，解决轮胎外胎扩张问题。
