failure theory

例句：

1. 1. The theory of evolution by natural selection is widely accepted by scientists.
   自然选择的进化理论被科学家广泛接受。
2. 2.The failure of the project was due to a lack of funding.
   项目的失败是由于缺乏资金。
3. 3. This theory has been proven to be correct in many cases.
   这一理论在许多情况下已被证明是正确的。