对于行星，这个洞就是由小行星或彗星碰撞打开的。
In the case of a planet, the hole is carved out by an asteroid or comet impact.
文件橱柜位置要注意避免走近的人员碰撞打开的抽屉。
Don't place file cabinets where people are liable to walk into open drawers.
文件橱柜位置要注意避免走近的人员碰撞打开的抽屉。
Don't place file cabinets where people are liable to walk into open drawers.
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