to describe an amount, a quantity, etc. using a particular unit of measurement （用特定度量单位）表示◆On the income statement, costs are expressed as a percentage of sales. 在损益表上，成本是用销售额的百分率表示的。◆Expressed in dollars, sales increased by 23%. 用美元表示的销售额增长了 23%。
to send sth by express post/mail 快递邮寄◆As soon as I receive payment I will express the book to you. 我一收到付款就把书用快递邮寄给你。