... crop tree 主伐木; 主林木 crop-tree thinning 主林木疏伐 crown-tree 双锯面对开材 ...
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crop-tree thinning 主林木疏伐
thinning of tree 疏伐
Tree thinning was employed in later years.
在以后几年进行间伐。
youdao
The agency said Nant y Bryn brook in the Crychan forest was polluted during a "tree thinning operation" and contractors working for the commission were responsible.
BBC: Forestry Commission fined ?24,000 for Powys pollution
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