名词
中文翻译：节孔
同义词：
['knobhole', 'knothole']
例句：
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1.The old tree has a knothole in the trunk where a bird nests.
这棵老树的树干上有一只鸟巢，是个节孔。
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2. The old house had several knotholes that were difficult to repair.
那所旧房子有几个难以修复的节孔。
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3.The engineer carefully examined the knothole and determined its cause.
工程师仔细检查了那个节孔，并确定了其原因。