It is found that deficit in working memory is the essential cause of mathematical learning disabilities.

已有研究表明，工作记忆的缺陷是数学学习困难的根本原因。

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The essential cause that influenced Hankou' s commerce culture was its excellent geographic location.

影响汉口商业文化最本质的原因是地理位置。

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The lack of interest ties within the specialized village community is an essential cause for its reorganization predicament.

专业村内部利益纽带的缺失是专业村之所以出现整合困境的根本原因。

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The boards say they are distressed over the potential harm an outdated or unsuitable contact lens can cause, making verification of a valid prescription essential.

FORBES: An Eye For An Eye

"If travel is essential, the public should avoid exposed or coastal areas where gusts could cause significant harm to individuals, " he said.

BBC: Wind damaged house

On the face of it, genes that cause diseases do share one thing: they are, in a technical sense, non-essential.

ECONOMIST: Genetic disease and evolution