the bad坏人；恶人theart.那；这；这些；那些adv.（用于比较级前）更加；用于最高级前；(用于形容词、副词比较级前)越 ... 越 ...the vulnerable group弱势群体the idea of equality平等观念the city young women城市青年女性the storm and stressn.狂飙运动The Yuedong Oilfield月东油田thermogram of breast乳腺热图the secondary system二次系统The public companies上市公司the Mu Us Sandy Land毛乌素沙地thermomagnetic motor热磁电动机

1. They kept dunning us about the overdue bill.
   他们一直在向我们催讨过期的账款。
2. The check becomes invalid after the specified date.
   支票过期作废。