extra cost

基本解释

This feature is included with the database server at no extra cost.
该特性是数据库服务器附带的，没有额外成本。
“Their ability to pass the extra cost to consumers is going to depend on the demand,” Brown said yesterday in a telephone interview.
“他们将额外成本传导给消费者的能力将会依赖于需求情况，”布朗在昨天的一个电话采访中说。
If Dr Gonzalez-Garcia is correct, then physicists will have opened a direct window on the subterranean world—at a minimal extra cost.
如果加西亚博士是对的，那么物理学者就将打开一扇通向地下世界的窗户——以最小的额外成本。

This extra cost is the insurance premium.
I think these extra pictures sometimes they're helpful, sometimes they just make the book cost a lot more.
我想这些补充的图片有时是有用的,有时仅仅是把书价抬高了一点
耶鲁公开课 - 基础物理课程节选
At the margin, I'm reaping, I'm bearing the cost for the extra unit of effort I contribute, but I'm only reaping half of the induced profits of the firm, because of profit sharing.
从边际角度分析,我承担了多付出的全部边际成本,但我却只能得到一半的边际收益,因为利润是均分的
耶鲁公开课 - 博弈论课程节选

But Denon's DVD-9000 may have just enough bells and whistles to elicit the extra cost.
FORBES: Magazine Article