n.安慰剂；宽心话；为死者所诵的晚祷词；（试验药物用的）无效对照剂 变形： 复数：placebos 英英释义： placebo[ plə'si:bəu ]n.an innocuous or inert medication; given as a pacifier or to the control group in experiments on the efficacy of a drug(Roman Catholic Church) vespers of the office for the dead