名词
中文翻译：Unknown
同义词：
['subordinate bark', 'secondary growth', 'secondary layer']
例句：
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1. The tree's secondary bark is thin and easily peeled off.
这棵树的次生树皮很薄，很容易剥落。
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2. The researcher found that the secondary bark of the tree had unique properties.
研究者发现这棵树的次生树皮具有独特的性质。
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3.The secondary bark provides a protective layer for the tree.
次生树皮为树木提供了一层保护层。