单词：observational study
observational study的用法和样例：
例句
- Pacifier use was associated with reduced duration of breast-feeding in most observational studies.在多数观察研究中，使用安抚奶嘴与减少母乳哺喂期间有关。
- This was an observational study and therefore treatment strategy was not randomised but left to the discretion of the individual doctor or the patient.这是一个观察研究，而且治疗策略也不随机，但它留给医生或患者很多思考。
单词：observational study 相关文章
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