test observation

例句：

1. 1. The scientist conducted a test observation on the new drug's effectiveness.
   科学家对新药的有效性进行了实验观察。
2. 2. During the experiment, the teacher observed the students' behavior closely.
   在实验过程中，老师仔细观察了学生们的行为。
3. 3. The researcher made several test observations before drawing any conclusions.
   研究员在得出结论之前进行了几次实验观察。