Auxanometer an instrument designed to measure the increase in length of a plant part.
植物生长测定器(生长计)：专门设计出的一种用来测量植物体长度增长的仪器。
The length of root is an important index that stands for the plant development level.
而根的长度是根发育水平的一个重要的指标。
The length of root is an important index that stands for the plant development level.
而根的长度是根发育水平的一个重要的指标。
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