And the more positive a doctor is when telling a patient about the placebo he is prescribing, the more likely it is to do that patient good.
并且在向患者描述疗效的时候，医生显得越积极，对于患者来说安慰治疗的疗效越好。
It can be positive (a beekeepers' bees pollinating neighboring crops) or negative (pollution from a power station).
外部性可能是有益的(养蜂人的蜜蜂为邻居的庄稼授粉)，也可能是有害的(如来自发电厂的污染)。
RESULTS: of the 40 cases of chronic dacryocystitis patients with lacrimal secretion culture, 39 cases were positive, a total of 50 strains positive bacteria were isolated.
结果：40例慢性泪囊炎患者泪囊分泌物培养，39例为阳性，共分离出50株阳性菌。
RESULTS: of the 40 cases of chronic dacryocystitis patients with lacrimal secretion culture, 39 cases were positive, a total of 50 strains positive bacteria were isolated.
结果：40例慢性泪囊炎患者泪囊分泌物培养，39例为阳性，共分离出50株阳性菌。
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