TPO 阅读是一个非常好的语料库，里面的内容大都是科普类的很难直接搬到我们的作文中，但是论证所需的词、短语、句式、乃至结构都完全可以搬到我们的写作中来。很多童鞋在写作时才会感叹”书到用时方恨少“，举一个最简单的例子：表达”重要“除了important大家还能想出哪些亮眼表达？下面就让TPO例句告诉你，important的表达其实完全可以更生动。
TPO 例句
Trade was the mainstay of the urban economy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges. [TPO 16-1-1]
自从中东地区的商旅们成功跨越周围的戈壁，只有水路和山峦还是障碍时，贸易就成为了中东地区城市经济的主要支柱。
重点词汇
the mainstay of something
A mainstay holds everything together, whether it’s your grandmother who acts as the anchor of your whole crazy family, a pillar that physically keeps a building from falling down, or the job that enables you to pay your rent every month. The noun mainstay is originally a nautical term meaning the rope that stabilizes two masts on a sailboat, and since the 1780s it’s been used to mean “chief support.”
a) an important part of something that makes it possible for it to work properly or continue to exist
Agriculture is still the mainstay of the country’s economy.
Cocoa is the country’s economic mainstay.
Even during conflict, I argue that family and friends are the mainstays of this world.
Salon(Nov 25, 2016)
b) someone who does most of the important work for a group or organization:
She was the mainstay of the team.
He has been a mainstay at baseball and basketball games.
New York Times(Nov 14, 2016)
Trump countered on election day, piling up huge majorities among the non-college-educated, blue-collar whites who have long been the mainstay of his support.
Los Angeles Times(Nov 09, 2016)
