analgesic [ˌænəlˈdʒi:zɪk]

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n.镇痛剂；adj.止痛的

a type of drug which stops you from feeling pain

The hospital advised an analgesic for chest and shoulder pains. 医院建议用止痛药治疗胸部和肩部疼痛。
Aspirin is a mild analgesic. 阿司匹林是药性平和的止痛药。