1、经常的英语:often,英 [ˈɒfn] 美 [ˈɔːfn]。
2、人们经常谈到两者的相似之处。The similarities between the two have often been remarked on。
3、这种疾病经常潜伏多年而不被察觉。The disease often goes/ remains undetected for many years。
4、从前的夏天,我们经常泛舟湖上。We used to go sailing on the lake in summer。