So his advice is to pull the plant out of the container, then cut the bottom half of the root ball into four parts.

所以，他建议将植物从容器中取出来，将底下一半的球状根系切成四部分。

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When you pull my tooth will you also have to extract the nerve and the root?

当你拔牙的时候，你也得摘除神经和牙根吗？

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Contractile root a specialized root developed by certain bulb-and corm-forming plants that serve to pull the bulb or corm down to the appropriate depth in the soil, e. g. Crocus.

收缩根的作用是把形成的鳞茎或球茎定位于土壤的某一特定深度，例如番红花属的植物。

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