究

例句：

1. 1. The scientist is conducting a thorough investigation into the cause of the disease.
   科学家正在对这种疾病的原因进行彻底调查。
2. 2. The detective is trying to solve the mystery by examining all the evidence.
   侦探正试图通过审查所有证据来解开这个谜团。
3. 3. The students are studying the history of ancient China for their final exam.
   学生们正在为期末考试研究中国古代历史。