noun 下载 🔗分享 草履虫 An oval-shaped protozoan organism of the genus Paramecium. Examples : "Under the microscope, the science student observed several paramecia swimming in the pond water sample. " 在显微镜下,这位理科学生观察到几只草履虫在池塘水样本里游动。 organism biology microorganism animal 与AI对话词汇游戏阅读练习