For an idea ever to be fashionable is ominous, since it must afterwards be always old-fashioned.
因为一个想法一旦流行起来就是不祥的预兆，因为它以后一定会过时。
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Popularity
因为一个想法一旦流行起来就是不祥的预兆，因为它以后一定会过时。