underground portion是什么意思 underground portion怎么读
underground portion的用法和样例
- The roots are the underground parts of the tree that supply it with nourishment.
树根是树的地下部分，用于供应养分。 - Effect of laser process Chinese pine on the seedling growth of both aerial and underground part is studied.
研究了用激光处理油松种子对其幼苗地上部分和地下部分的影响。
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