名词
中文翻译：外茎
同义词：
['outer trunk', 'outer stem']
例句：
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1.The tree's out-trunk is visible from the road.
从马路上可以看到这棵树的外干。
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2. The loggers used a chainsaw to cut down the out-trunk of the tree.
伐木工人用链锯砍断了这棵树的外干。
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3. The out-trunk of the tree was covered in moss and lichen.
这棵树的外干被苔藓和地衣覆盖着。