"He is at 50 or below in most surveys, and that is mainly because of the economy, which continues to be stubbornly weak, the unemployment rate is very high and still in double-digits, and as a consequence Obama does not have much margin for error,".

VOA: standard.2010.01.06

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

On Saturday,Canada broke the record for the biggest margin of victory in Olympic women's ice hockey with an 18-0 trouncing of Slovakia.

VOA: standard.2010.02.15

President Obama is telephoning Democrats to urge them to vote for the legislation, as Democratic leaders work furiously to assure the 216 vote margin required for passage.

VOA: standard.2010.03.19