Treasury Secretary Tim Geithner says the financial crisis developed in part because the existing system let some companies "shop for the weakest regulator."

VOA: special.2009.06.19

You could imagine a protein that's existing inside a cell at some level of abundance.

想像一下,在细胞中有一种大量存在的蛋白

耶鲁公开课 - 生物医学工程探索课程节选

Some gardeners prepare an area by removing the existing top soil and grass.

VOA: special.2009.07.07

However,Professor Cacioppo says existing research offers some possibilities.

VOA: special.2009.12.22

President Obama faces united Republican opposition to his health care reform plan, which would expand coverage to some 30 million more Americans, and take steps such as ending insurance company practices of denying coverage for pre-existing medical conditions.

VOA: standard.2010.03.10