名词
中文翻译：Unknown
同义词：
['bark', 'sapwood', 'heartwood']
例句：
-
1. The tree's trunk is covered in thick, purves lignin.
这棵树的树干覆盖着厚厚的树皮。
-
2. The woodworker carefully removed the purves lignin from the log.
木匠小心翼翼地从木料中剥离了树皮。
-
3. The purves lignin on the bark helps protect the tree from disease and insects.
树皮上的树皮有助于保护树木免受疾病和昆虫侵害。