Definition: a small amount of a substance that a doctor or scientist collects in order to examine it Level: C2
实验室要求提供尿液样本进行分析。
The laboratory requested a urine ___sample for analysis.
采集血液样本后，医生将它们送到实验室。
After collecting the blood ___samples, the doctor sent them to the lab.
土壤样本可以揭示许多环境条件信息。
A soil ___sample can reveal a lot about environmental conditions.
