The president's second stop is at the General Motors plant that manufactures the Chevrolet Volt, an electric and gas-powered vehicle that some say might revolutionize the industry.

VOA: standard.2010.07.29

Now, when the first chimpanzee hits the lever the second chimpanzee gets a painful electric shock, putting the first chimpanzee in a horrible dilemma.

当第一只黑猩猩拍杠杆时,第二只黑猩猩就会受到痛苦的电击，这样第一只黑猩猩就进退两难了。

耶鲁公开课 - 心理学导论课程节选