He says neither side expects a major shift in relations, but the White House does have reason for concern.

VOA: standard.2009.11.12

If you followed a diet where you ate less junk food and ate more fruits and vegetables, for example, just those two little rules you would help shift around this balance of sugars in a way that would benefit health.

如果你遵循一个饮食原则,比如,少吃垃圾食品多吃水果和蔬菜,仅仅这么简单的两条,就会在一定程度上帮你调节糖类摄取平衡,这个对健康有好处

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But a shift in emphasis to security issues offers a new set of challenges for the president.

VOA: standard.2010.01.06

So for a company that is just launching, or launching a new product line, or is making a big company shift, the Super Bowl offers a unique platform."

VOA: standard.2010.01.27

"But I do think that in general we have seen a shift from, for lack of a better term, professionalized terrorist operations to those that are conducted by not exactly amateurs, but folks with less training and less capability generally, technical capability."

VOA: standard.2010.05.05