"they had not done any work theretofore"
以上来源于: WordNet
ADV before that time; previous to that 在那以前; 直到那时 [正式]
Coincidentally, BOJ was shocking the world with a theretofore unheard of zero interest rate policy.
FORBES: On-Line Brokers and the (Unfulfilled) Promise of Tokyo's "Big Bang"
The new method that Fust now controlled allowed him to mass produce at low cost products that theretofore had been very expensive and time-consuming to produce by hand.
FORBES: Disruption, Inventors, and Investors
Theretofore, the company had only produced these products within Japan.
FORBES: Japan's Automakers Face New Challenges (1): Toyota in China
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