名词
中文翻译：Unknown
同义词：
['main cause', 'fundamental cause', 'essential cause']
例句：
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1. The primary cause of the accident was a malfunctioning brake system.
事故的主要原因是一个制动系统失灵。
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2. The company's poor management is the primary cause of its declining profits.
公司管理不善是其利润下降的主要原因。
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3.The researcher found that the primary cause of the disease was a genetic mutation.
研究者发现这种疾病的主要原因是基因突变。