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》

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。

youdao

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。

youdao

The U.S.Environmental Protection Agency,or EPA, lists stormwater as the primary cause of water pollution in the United States, and encourages local communities to develop management plans to treat run-off before it pollutes their rivers, lakes or streams.

VOA: standard.2010.08.04

Every day, 2.5 billion people are exposed to the primary cause of death: unsafe water.

UNESCO: Post-Conflict and Post-Disaster Responses

The slow economic growth of the 2000s was the primary cause of the fiscal problems we face today.

FORBES: Memo To Paul Ryan: It's Time To Think About Plan B

The square windows on the original Comet jetliner were found to be the primary cause of its disintegration.

ECONOMIST: Aircraft fatigue