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The vascular ray was developed and the development of periderm was obvious.
维管射线发达，周皮发育明显。
youdao
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It had secondary structure and the secondary protective tissue was periderm.
具有次生结构，次生保护组织为周皮。
youdao
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It had secondary structure and the secondary protective tissue was periderm.
具有次生结构，次生保护组织为周皮。
youdao