We need to go back to the drawing board.
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We had to go back to the drawing board.
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We got back to the drawing board and figured out why it broke and how we could make it better.
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Well, that didn't work at all, so it's back to the drawing board, I guess.
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After the original plan failed miserably, they decided to go back to the drawing board and come up with something new.
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英语 example sentences with "back to the drawing board"