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。

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If the test is positive, a course of antibiotics may be prescribed.

如果化验结果呈阳性，可能要开一个疗程的抗生素。

《柯林斯英汉双解大词典》

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)。

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Many doctors recognize that patients,like Daniel, with strong family support, a positive attitude and an active spiritual life have a greater chance to survive.

VOA: standard.2010.01.12

So, for example, if we were looking at the actual wave function, we would say that these parts here have a positive amplitude, and in here we have a negative amplitude.

我们看，一个波函数,我们说，它这部分幅值，为正,这部分幅值为负，当我们看。

麻省理工公开课 - 化学原理课程节选

And when we're talking about the amplitude of the wave, we're talking about the deviation from that average level. So, if we define the average level as zero, you can have either a positive amplitude or a negative amplitude.

当我们讨论一个波的振幅时,我们说的是偏离平均位置的量,如果我们把平均位置,定义为零的话，那幅值不是,正的就是负的，有时候人们在。

麻省理工公开课 - 化学原理课程节选

U.S. stock futures are pointing toward a positive open, putting stocks on track for a positive end to a rather eventful week.

FORBES: Futures Point to Positive Open, SPX and VIX Data Point to Trouble

And to the extent that this is a positive step -- a small step, but a positive step, that's a good thing.

WHITEHOUSE: Press Briefing

The Mets needed something positive a day after learning ace Johan Santana will likely miss the season with a re-torn left shoulder capsule.

WSJ: Mets' Wright makes first appearance in 2 weeks