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1·His misunderstanding of language was the primary cause of his other problems.

他对语言的误解是他其他问题的主要原因。《柯林斯英汉双解大词典》

2·You have to know the primary cause of it.

你必须知道的首要原因的。

3·A primary cause of Tom's failure is his laziness.

懒惰是汤姆失败的主要原因之一。

4·The primary cause of Tom's failure is his laziness.

汤姆失败的根本原因是懒惰。

5·But female choice probably is not the primary cause of the traits.

但是，女性的选择或许不是导致这些特征的首要原因。

6·But if they do, the company he runs will be the primary cause of it.

如果真的发生了，他所执掌的公司应该是主要原因。

7·It is the primary cause of recurrent ear infections in children.

它也是造成孩子周期性耳朵感染的主要原因。

8·But these days, the primary cause of foreclosures is unemployment.

但这些天，丧失抵押品赎回权的主要原因是失业问题。

9·One primary cause of failures is incomplete, vague, or ambiguous requirements.

失败的一个主要原因是不完整的、含糊的或不明确的需求。

10·Negative exterior influence is the primary cause of environmental pollution.

负外在效应是造成环境污染的一个重要原因。