Onceuponatime，ahippo（河馬）livedinarivernexttoabigtree．One...
問題詳情：Onceuponatime，ahippo（河馬）livedinarivernexttoabigtree．Oneday，abirdcameandnested（築巢）inthetree．Thesongsofthebirdfilledthehippowithsomuchenvy（羨慕）thathecouldn’tthinkofanythingelse．Everydayhewouldthinkwh...