Somatic mutation, a main biological phenomenon of citrus and other fruits, is often used for breeding as a major variation source. Spontaneous mutations often occur in citrus.

体细胞突变是柑橘等果树比较常见的生物学现象，也是品种选育，即芽变选种的主要变异来源。

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The deflation algorithm used by gzip (also zip and zlib) is an open-source, patent-free variation of the LZ77 (Lempel-Ziv 1977) algorithm.

gzip(也称zip或zlib)所使用的算法是开源、无专利的LZ77 (Lempel - Ziv 1977)算法的变体。

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Mr Sims used a dash of theory to analyse the error terms in his equations and isolate the impact of the "fundamental shock", the primary source of unanticipated variation.

他用了少许的理论来分析他的等式中的误差，并且把不能预料到的变量的最基本的来源，那些最基本的冲击影响隔离起来。

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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