1、經常的英語:often,英 [ˈɒfn] 美 [ˈɔːfn]。
2、人們經常談到兩者的相似之處。The similarities between the two have often been remarked on。
3、這種疾病經常潛伏多年而不被察覺。The disease often goes/ remains undetected for many years。
4、從前的夏天,我們經常泛舟湖上。We used to go sailing on the lake in summer。