Educators say the goal will be to improve student academic performance in math, science and technology courses, while giving them the tools they need to build lasting professional careers in a 21st-century, knowledge-based economy.

VOA: standard.2010.05.10

There are definitions based on form, circularity, symmetry, economy of form, lack of economy of form, and repetition.

有些定义是基于形式，循环，对称，形式的精简与否，重复。

耶鲁公开课 - 文学理论导论课程节选

Pittsburgh earned eighteenth place as researchers pointed to a relatively stable economy based on higher education and health care.

VOA: special.2009.07.13

America's support for democracy will therefore be based on ensuring financial stability,promoting reform and integrating competitive markets with each other and the global economy.

VOA: special.2011.05.27

They wanted the country's economy to be based only on gold.

VOA: special.2010.06.17

Russia,according to Mr.Medvedev, must move from an economy based on natural resources to innovation and high tech, which will require democratization.

VOA: standard.2009.11.12

"Our plan is based on the belief that fast-acting tax relief is the most effective way to put our economy back on track,"

VOA: standard.2009.10.03

What we ought to be doing is pursuing the kind of broad-based prescription for recovery and stimulating this economy that has always worked: fiscal discipline in Washington and tax relief for working families, small businesses and family farms."

VOA: standard.2009.08.02