duration

期限，持续时间

【例】The duration of this Agreement is one year and can be automatically extended for a further year on expiration.

本协议的有效期为一年，到期可自动展期一年。

during

在……期间，在……时候

一般可与in互换。

【例】Please quote your lowest prices for delivery FOB Manchester during early July.

请报给7月上旬交货的最低的曼彻斯特离岸价格。

duty

【1】责任，义务

【例】We feel it our duty to inform you that this is an important order, on which future business depends.

有责任奉告贵方，此系重要的订货，未来的业务将视其情况而定。

【2】税

①【例】Our office equipment would not be liable for import duty.

我们办公设备不大可能要交纳进口税。

②大多用复数形式表示单数的意义。

【例】In times past, if a foreign enterprise in Shenzhen wanted to sell its products in the domestic market in China, it must have the approval of the Guangdong Provincial Administration of Special  Economic Zones and pay customs duties.

在过去，深圳外国企业的产品若向中国国内市场销售，须经广东省经济特区管理委员会核准，并向海关纳税。