Some recent surveys show the president's overall approval rating at or just above 50 percent a far cry from higher numbers in the early days of his administration.

VOA: standard.2009.09.02

Food has changed in a lot of ways from the early ancestral days.

自人类早期起,食品在各方面发生变化

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Food has changed in a lot of ways from the early ancestral days.

自人类早期起,食品在各方面发生变化

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选