...年都会出现踪迹，属于每年生的(Annual)蝉；而 所有幼虫会挤在同一年出现，大量羽化为成虫的蝉，则称为周期蝉(Periodical cicada)，布鲁德X 蝉就是其中之一。
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... 十七年蟑 periodical cicada 百龄坛十七年 ballantine's 17years 十七年故弄玄虚 seventeen years ...
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Meanwhile, Keith Clay, of Indiana University in Bloomington, is studying the idea that periodical-cicada broods are getting bigger over the decades.
ECONOMIST: The 17-year cicadas are about to emerge in force
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