1. They are conducting a study on sleep.
他们正在进行一项关于睡眠的研究。
2. This study found that sleep is important for health.
这项研究发现睡眠对健康很重要。
3. Scientific research requires rigorous methods.
科学研究需要严谨的方法。
4. The results of this study are meaningful.
这项研究的结果很有意义。
5. She is studying the functions of the human brain.
她正在研究人类大脑的功能。