单词：root cap
root cap的用法和样例：
例句
- The root cap protects the growing parts of a root as the root grows through the soil.根冠保护根的生长区域在土壤里向前运动。
- It is an important pathway for movement of these substances outside the xylem, for example across the root cortex.质外体是木质部外方物质运动的一个重要途径，例如物质穿过根冠。
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