a crevice in a wall的用法和样例：
- A small opening, as in a wall or rock face; a crevice.
- A small opening, as in a wall or rock face;a crevice.
- And a roach spans a crevice in the floor.
- That evening, when his accomplices were counting the gold and rejoicing, he hid the purse in a crevice in his cave.