Roughly 30,000 children and their parents from across the country were able to get tickets through the Internet for this year's White House Easter Egg Roll.

VOA: standard.2009.04.13

You've taken all the proteins inside the white of the egg, for example, you raise the temperature.

对蛋清部分所有的蛋白质,比如说进行加热

耶鲁公开课 - 生物医学工程探索课程节选