A cell

例句：

1. 1. Cells are the basic building blocks of life.
   细胞是生命的基本构成单位。
2. 2.The study of cells is crucial for understanding the functioning of the human body.
   研究细胞对于理解人体功能至关重要。
3. 3.Cells communicate with each other through chemical signals.
   细胞通过化学信号相互交流。