"Basically,it's an underwater balloon. You've got two parts to it: You've got the balloon here - which is this long cylindrical object - and that's filled with a lighter-than-water substance, which is aviation gasoline."

VOA: standard.2010.06.21

Lane looked faintly interrupted. "Why what?" " Why did you think it was going to go over like a lead balloon?"

莱恩微弱的问，什么为什么“,为什么你认为它像一个领头气球“

耶鲁公开课 - 1945年后的美国小说课程节选

It used to be that mortgages had what's called a balloon payment at the end.

曾有一段时间,抵押贷款中有期末大额偿还制度

耶鲁公开课 - 金融市场课程节选