Climbers have to pull themselves straight up the face of very high rocks or walls.

VOA: special.2009.12.09

If you go to the web just type in glycemic index, you can pull up chart after chart of high and low glycemic index foods, and sometimes you get surprised by what those foods are.

如果你在网上输入血糖指数,你会得到一个又一个,关于食物血糖指数高低的图表,有时你会被列表中的那些食物吓一跳

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选