knothole

详细解释:n. 节孔

英语解释：

名词 knothole:

a hole in a board where a knot came out

详细解释：

knot.hole

n.（名词）
A hole in a piece of lumber where a knot has dropped out or been removed.
（木板等的）节孔：木板上节瘤掉落或被取掉而成的空洞