8BU81、 dig digging dig-dug-dug2、 serious adj.认真的；严肃的 比较级：more serious 最高级：most serious adv.seriously be serious about sth. 对某事是认真的 My father is serious about his work. 我的父亲对工作很认真。 Dont laugh,boy. This is serious. 小伙子，别笑。这很严肃。 serious 严重的 The boy has a serious disease. 这个女孩得了严重的疾病。3、 reduce v.减少 反：increase reduce指在数量、数目上的减少 reduce to 减少到 reduce by 减少了 We can reduce his speech to threee sentences. 我们可以把他的发言减少到三句话。 As a result,cost
