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Gathering statistics on the scale of the problem is difficult.
按这个问题的规模来收集统计数据是有困难的。
youdao
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The problem is difficult to understand.
这个问题难于理解。
youdao
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The problem is difficult to solve in field of bellows designing.
该问题是波纹管设计的难点之一。
youdao
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The problem is difficult to solve in field of bellows designing.
该问题是波纹管设计的难点之一。
youdao