clamp for upper cover

例句：

1. 1. The car was securely fastened with a jack.
   汽车被一个千斤顶安全地固定住了。
2. 2. The door was securely clamped shut.
   门被牢固地夹紧了。
3. 3. The bolts were securely clamped in place.
   螺栓被牢固地固定在位。