This scarcity of biographical information is due primarily to his social position; he was not a noble, but the son of a leather trader.

传记信息不足主要是由他的社会地位造成的：他不是贵族，而是一个皮革商人的儿子。

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James Bentham, a co-author of the research from Imperial College, London, says the global trend is likely to be due primarily to improvements in nutrition and healthcare.

伦敦帝国理工学院的詹姆斯·边沁是这项研究的合著者之一。他表示，这种全球趋势可能主要归因于营养和医疗条件的改善。

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This query may seem complex, due primarily to its length.

该查询似乎很复杂，这主要是因为它的长度。

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But is their unpopularity due primarily to pushing for big changes in K-12 education?

FORBES: The Right Way to Approach School Reform

In 2009, Taiwan's GDP contracted 1.9%, due primarily to a 20% year-on-year decline in exports.

FORBES: Taiwan

Other than in North America, PDPs are outselling RPTVs due primarily to larger screen demand.

ENGADGET: Plasma HD sales overtake RPTVs worldwide HD