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1. The doctor uses a stethoscope to listen to the patient's heartbeat.
医生使用听诊器来听病人的心跳。
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2. The nurse carefully placed the stethoscope on the patient's chest.
护士小心翼翼地将听诊器放在病人的胸部。
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3. The doctor used the stethoscope to diagnose the patient's condition.
医生使用听诊器来诊断病人的状况。