Onceuponatime，ahippo（河马）livedinarivernexttoabigtree．One...
问题详情：Onceuponatime，ahippo（河马）livedinarivernexttoabigtree．Oneday，abirdcameandnested（筑巢）inthetree．Thesongsofthebirdfilledthehippowithsomuchenvy（羡慕）thathecouldn’tthinkofanythingelse．Everydayhewouldthinkwh...