And this traditional business model has not worked very well on the Internet, especially not in a bad economy.

VOA: special.2009.04.20

How is your immune system going to recognize that this virus is there causing bad results if it's living inside of a cell and doing all its business inside a cell where antibodies can't get to it?

你的免疫系统怎样才能识别,作恶多端的病毒呢,如果它隐藏在细胞中进行繁殖,而抗体又无法进入细胞,那该怎么办

耶鲁公开课 - 生物医学工程探索课程节选

of course, with any business you have the good clients and the bad,

当然，任何行业你都会既碰到很友善的客户也碰到不讨喜的客人，

什么样的客人都有 - SpeakingMax英语口语达人

The Conference Board said more Americans believed business conditions were bad and that jobs were hard to get.

VOA: special.2010.07.02

"The business is very bad. I want to sell the old stock.

VOA: standard.2010.07.21