Thus the professional investor is forced to concern himself with the anticipation of impending changes, in the news or in the atmosphere, of the kind by which experience shows that the mass psychology of the market is most influenced.

因此，专业投资者被迫关注新闻或气氛中即将发生的变化，经验表明，这种变化最能影响市场的大众心理。

They are concerned, not with what an investment is really worth to a man who buys it 'for keeps', but with what the market will value it at, under the influence of mass psychology, three months or a year hence.

他们关心的不是一项投资对一个“永久”购买的人来说真正值多少钱，而是三个月或一年后在大众心理的影响下，市场对它的估价是多少。