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Hours of problems, brown sugar is what to do?
时间的问题，红糖是什么做的？
youdao
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Difficult problems used to take hours of work with pencil and paper.
困难的问题以前总是需要用笔和纸工作数小时。
youdao
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Difficult problems used to take hours of work with pencil and paper.
困难的问题以前总是需要用笔和纸工作数小时。
youdao