They could be traded illegally. They would lose popularity.
它们会被非法售出，失去人气。
Concern that Web 2.0 is merely a buzzword or a fad, and like all fads, it will lose popularity as quickly as it gained it.
担心Web 2.0只不过是一时的流行，和所有的流行事物一样，流行得快，失宠得也快。
The support of women for his regime was vital and he feared that, like a Hollywood star, he would lose popularity with women if it emerged that he was no longer available.
由于妇女们对他的统治是至关重要的，他害怕如果让人知道他变得可望而不可及，他会像好莱坞明星那样，对妇女们的魅力将不复存在。
Websites like Twitter and Facebook might lose some of their popularity if users feel they have become a forum for advertising rather than gossip.
如果用户感觉到网站由聊天论坛变成了广告论坛，Twitter\Facebook这样的网站可能不那么受欢迎了。
Hot majors in the year they were enrolled might lose their popularity due to too many graduates in the same fields four years later.
四年之后，他们进校时的热门专业，可能会因为同一专业的毕业生太多而遇冷。
A passing fad is something that is very popular right now, but will lose its popularity in a short time.
就是现在正在流行的东西，但是在很短时间内就失宠。
A passing fad is something that is very popular right now, but will lose its popularity in a short time.
就是现在正在流行的东西，但是在很短时间内就失宠。
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