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When dead leaves break away, they leave behind waxy cells that form a small bud called a bundle scar.
树叶掉下之后,留下一些细胞,形成一种被称作维管束痕的小牙。
youdao
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When dead leaves break away, they leave behind waxy cells that form a small bud called a bundle scar.
树叶掉下之后,留下一些细胞,形成一种被称作维管束痕的小牙。
youdao