观察仪器

例句：

1. 1. The scientist observed the animal for several hours before making any conclusions.
   科学家观察动物几小时后才得出结论。
2. 2.The teacher observed the students during class and noticed that some were not paying attention.
   老师在上课时观察学生，发现有些学生没有集中注意力。
3. 3. The politician observed the public's mood and decided to make a change in his policies.
   这位政治家观察公众的情绪，决定改变他的政策。