单孢体

例句：

1. 1. Scientists have discovered a new species of single-celled organism in the ocean.
   科学家在海洋中发现了一种新的单细胞生物。
2. 2. The study of single-celled organisms is crucial for understanding the diversity of life on Earth.
   研究单细胞生物对于理解地球上生命的多样性至关重要。
3. 3. Single-celled organisms are often found in extreme environments, such as deep sea or deserts.
   单细胞生物通常存在于极端环境中，如深海或沙漠。