一只手放在岩块上，用另一只手的掌心撞它，若感觉振动，试著踢一踢或拉一拉石头。

Place one hand on the rock and bang it with the palm of the other hand. If vibration is felt try to kick or pull the rock.

youdao

一只手放在岩块上，用另一只手的掌心撞它，若感觉振动，试著踢一踢或拉一拉石头。

Place one hand on the rock and bang it with the palm of the other hand. If vibration is felt try to kick or pull the rock.

youdao