trade up

v.

买更高价的东西，使熟悉某一行；买高档货；

Bridging school to trade training & employment
The medical news
IPD 2013 Trade Show results
Purchase Applications Up, Wholesale Trade Up
Up The Bracket
MGM Trade Up 27%-1 Stock, 2 Different Entry Points. Which trade would you take?
Directives, standards, testing, certification round-up
AN ANALYSIS OF INDO-CHINA TRADE TRENDS (PAST & PROJECTED) IN THE POST-LIBERALISATION ERA
Trade and Environment Review 2013
How to use subsidies to sustain trade agreements