任务分配：在显微镜下观察洋葱表皮细胞和口腔上皮细胞。

Discover the fascinating world of cells by exploring their structures in both plant and animal cells through practical microscopy. Learn how key organelles like the nucleus, mitochondria, and chloroplasts function, and gain hands-on experience preparing slides of onion and cheek cells to observe these tiny life units directly. This engaging lesson combines theory with practical skills to deepen your understanding of cell biology.