1、经常的英语：often，英 [??fn] 美 [???fn]。
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。
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