1.After 30 days the debtor was warned that unless payment was made at once ,legal action would follow.
30天后债务人接到警告，除非立即偿债，否则对方将采取法律行动。 
重点词语：debtor n.①债务人 ②借方
商务用语：debtor and creditor 借方和贷方
bankruptcy debtor 破产债务人
aged debtors 长期债务人

2.Have you anything to declare?
你有东西要申报吗？（指应纳税的东西）
重点词语：declare v.①断言，宣称 ②（向海关）申报进口应纳税之物
商务用语：declare in favor of something 声明赞成某事
declare off 宣布作废，毁约，宣布退出

3.The price of 14 inches TV set declined from 400 to 320 yuan each.
14英寸的电视机每台从400元降到320元。
重点词语：decline v.①下降，衰落 ②拒绝 n.①下倾，下降，斜面 ②衰败
商务用语：decline an offer 拒绝请求
decline an invitation 谢绝邀请

4.This shows a slight decrease on the numbers of the previous month.
这表明比前一个月的数目略有减少。
重点词语：decrease n.①减少 ②减少之量 v.减少
商务用语：estimated net decrease 估计净减额
linear decrease 直线下降

5.He defected from the party over the issue of free trade.
他在自由贸易的问题上背叛了自己的政党。
重点词语：defect n.过失，缺点 v.变节，背叛
商务用语：have the defects of one's qualities 美中不足
in defect of 假如没有…时；在没有…情况下
zero defect 无事故，无瑕疵