The root of the tree rotted away.
树根烂了。
And since they had no root, they withered away.
日头出来一晒，因为没有根，就枯干了。
You are cutting them away at the root.
你把它们连根砍断了。
The root is covered with cementum, which is worn away more easily than enamel.
牙根部覆盖着牙髓，它比牙釉质更易磨损。
The root is covered with cementum, which is worn away more easily than enamel.
牙根部覆盖着牙髓，它比牙釉质更易磨损。
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