例句：

　　Snow geese are very gregarious birds.

　　雪雁是群居性鳥(niǎo)類。

　　The Thames was in spate, with flocks of Canada geese speeding downriver.

　　泰晤士河河水暴漲，成群的加拿大雁迅速游向下游。

　　The wild geese fly from north to south.

　　大雁由北向南飛。