expertise   

【1】专有技术

【例】His business expertise will be of great help to us.

他在商业上的专有技术对我们会有很大帮助。

【2】专门知识和技能，专长

【例】We are pleased to note that you possess considerable experience and expertise relating to the design and construction of plants which manufacture motorcars.

我们高兴地得知，贵方对汽车制造厂的设计与建造颇有经验与专长。

expiration 

期满，终止

【例】We recommend you in your own interest to make a nearly decision as the expiration of our offer is imminent.

我方报盘的有效期将很快终止，盼贵方为了自身的利益及早作出决定。

expire  

终止，到期，期满

【例】The Agency Agreement will expire next month.

该代理协议下个月期满。