分层依照昆虫在受害树木的密度分布而定； 例如研究发现皮蠹分 布的主要变异来源 (source of variation)是树木的垂直高度， 因此受害树木的高度 经常被分为几个取样层。
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统计学英语,次统计学_名词中文_英语对照 ... sorting table 收拾整顿表 sources of variation 变异来历 square deviation 方差 ...
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suspected source of variation 怀疑变异来源
·2,447,543篇论文数据，部分数据来源于NoteExpress
A firm's embedness in a network of ties is an important source of variation in the acquisition of competitive capabilities.
本文论述了企业知识网络的重要性，说明企业在关系网络中的嵌入是获取竞争能力的重要来源。
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Countless firms, busily tinkering with their business models, provide a source of variation.
ECONOMIST: Evolutionary economics is surviving, but not thriving
"The initial set of indicators suggests wide variation in both practice and outcomes between maternity units which is a source of concern for the specialty as we cannot be sure that every woman is getting the best possible care, " he said.
BBC: Maternity care varies across England
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