诉讼主因

例句：

1. 1. The main reason for his resignation was the lack of funding.
   他辞职的主要原因是没有资金。
2. 2. The company's poor performance was mainly due to its inefficient management.
   公司业绩不佳主要是由于管理不善。
3. 3. The success of the new product was primarily due to its unique features.
   新产品的成功主要是由其独特的特点决定的。