请用英语回答：What is "cash flow"?

请用英语回答：What is cash flow? if you were short of cash and had to sell something , what would you sell? Would you sell your book?请用英语回答.谢谢! if you were short of cash and had to sell something , what would you sell? Would you sell your book?请用英语回答.谢谢! [英语]The UN is short of cash.请用英语解释该句子The UN is short of cash.请用英语解释该句子,翻译自重. What is greenhouse effect?请用英语回答 要最准的 what is hardware?如题`急用`请用英语回答.. what is output?如题`急用`请用英语回答.. What is a cash register? why cash flow is important to company我想知道用英语如何回答这个问提，中文也行 what is history 我是用英语来问,请用英语回答. what is stress?请大家用英语回答 什么是压力? What is Total Quality Management?What is the difference between TQM and traditional management?请用英语回答问题. what Color is it ?用英语回答 what is black?用英语怎么回答 what is mercantilism ?（用英语回答） 用英语回答 WHAT IS A-LEVEL what is your favorite festival?why?请用英语回答,答案足够说两分钟. What is Incoterms 2000?请用英语帮回答我这个问题,