Haveyoueverheardofan的精選

問題詳情：Haveyoueverheardofaninsectcalledthecicada(蟬)?36 Buttheyhaveaninterestinginternalclockthattellsthemwhentogoaboveground.Every17years,billionsofthenoisyBroodVcicadas(十七年蟬)willswarm(成羣出現...