For many years, people in American cities have depended on farmers in rural areas to grow fruits and vegetables.

VOA: special.2010.07.06

Vegetables can be grown many times in places where you could never grow wheat or grain.

也许不能生产小麦和谷物的土地,蔬菜却可以长好几季

耶鲁公开课 - 古希腊历史简介课程节选

One problem that people have is understanding what a portion is, because you say we should have this many servings of fruits and vegetables a day, we should have this many servings of that a day.

人类很难理解每餐食物摄入量这概念,因为假设,我们一天应该摄入一定份量的水果和蔬菜,各种食物每天都有一定摄入量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选