microstrain

例句：

1. 1.The researchers isolated a new strain of bacteria that can resist antibiotics.
   研究人员分离出了一种能抵抗抗生素的新细菌株。
2. 2.The microbial ecosystem plays an important role in the carbon cycle.
   微生物生态系统在碳循环中起着重要作用。
3. 3. Microstrains are used to study the effects of different environmental factors on plant growth.
   微量菌株用于研究不同环境因素对植物生长的影响。