a clearance of one metre的用法和样例：
- There is a clearance of only five inches.
- Made a clearance of clothes out of season.
- It was sealed by a wall and contained chalky soil to the depth of one metre.
- There was a clearance of only ten centimetres between the two walls.
- A global rise in sea level of one metre would almost completely inundate the coastal areas of Bangladesh. Island nations and continental beaches and cities would be endangered.