What is a staple food?

A staple food, sometimes simply referred to as a staple, is a food that is eaten routinely and in such quantities that it constitutes a dominant portion of a standard diet in a given population, supplying a large fraction of the needs for energy-rich materials and generally a significant proportion of the intake of other nutrients as well. (Wikipedia - http://en.wikipedia.org/wiki/Staple_food)

Question:

What is the word for "staple food" in Chinese?

• Please input the Chinese characters first followed by a space and then the pinyin.
• Please write numbers for the pinyin tones, e.g. zhong1guo2