低等腔肠动物

例句：

1. 1.The scientist used a microscope to examine the artifacts on the table.
   科学家使用显微镜来检查桌子上的文物。
2. 2. He reached for his handkerchief and wiped his sweaty forehead.
   他伸手去拿手帕擦汗。
3. 3.She held her arms out wide to embrace her friends.
   她张开双臂拥抱她的朋友们。