micro sample

例句：

1. 1. This micro sample shows the distribution of bacteria in the soil.
   这个微样本显示了土壤中细菌的分布。
2. 2. The researcher collected a micro sample from the patient's blood.
   研究人员从病人的血液中采集了一个微样本。
3. 3. Micro samples are often used to test for diseases before they spread.
   微样本通常用于在疾病传播之前测试疾病。