noun 下载 🔗分享 草履虫,纤毛虫 Any of the many minute aquatic creatures, such as protozoa and unicellular algae, found in freshwater habitats. Examples : "Under a microscope, the pond water revealed a teeming world of infusoria, including tiny protozoa darting amongst the algae. " 在显微镜下,池塘水展现出一个生机勃勃的世界,里面充满了纤毛虫之类的微小生物,可以看到细小的原生动物在藻类中穿梭。 organism microorganism biology environment nature animal science 与AI对话词汇游戏阅读练习