System of sustained working
伞伐作业 System of successive regeneration fellings 保续作业 System of sustained working 植物分类学 Systematic botany ..
基于12个网页-相关网页
... 保续收获 Sustained yield 保续作业 Sustained yield working 撑壁 Sustaining-wall ...
基于8个网页-相关网页
短语
严正连年保续作业
Strict annual sustained working
;
Equalised annual sustained working
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