... Roof 顶盘、天盘 Root hole 根穴 Rotary boring 旋转式钻孔 ...
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hole of tree root 根系孔穴
root ventilation hole 叶根通气孔
Hole root system growth method 孔洞根系生长法
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The root hole of a toppled tree is one such source.
倾倒的树木的树根洞就是这样一个地方。
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One morning in September 1940, a boy called Marcel Ravidat was exploring the hills above Montignac when his dog, Robot, uncovered a hole beneath a tree root leading to a cave.
BBC: The perfect trip: Dordogne
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