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。