roughness factor 粗糙因素 ; 粗糙度系数 ; 相对粗糙度 ; 粗糙因子
relative roughness factor 相对粗糙度
Manning roughness factor 曼宁糙率系数
surface-roughness factor 表面粗糙度
flood roughness factor 洪水糙率
surface roughness factor 表面粗糙度
basic roughness-inducing factor 基本致粗因子
factor roughness
粗糙度因素
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"At this point we can't make too many firm conclusions, but we see changes at millennial to multi-millennial timescales, where the roughness increases by a factor of five, " explained Ryan Bay, a physicist at UC-Berkeley.
BBC: The dust loggers were sacrificed at the bottom of the holes
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