examination of a scheme

例句：

1. 1. The doctor conducted an examination of the patient's symptoms before making a diagnosis.
   医生在做出诊断之前，对病人的症状进行了检查。
2. 2. The committee will hold an examination to evaluate the effectiveness of the new policy.
   委员会将举行一次审查，以评估新政策的有效性。
3. 3.The scientist conducted an examination of the samples to determine their chemical composition.
   科学家对样本进行了检查，以确定它们的化学成分。