a wedge-shaped crevice的用法和样例：
- And the shape of the vertebrae in women tapers off toward the back, creating a wedge shape that further facilitates arching, Whitcome said.
- A wedge - shaped charge pointing downward.
- He cut the cake into pieces and gave each of us a wedge.
- He had a banana and a wedge of cheese for lunch.
- His nomination drove a wedge into party unity.