often是什麼意思 often怎麼造句呢

1、often adv.時常; 常常; 往往; 大多;

2、[例句]The disease often goes/ remains undetected for many years.這種疾病經常潛伏多年而不被察覺。

3、[其他]比較級：more often 最高級：most often。