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只有经过认真研究才能回答这些问题。
Careful research is needed to answer these questions.
youdao
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不经过认真研究而要发现事实真相是非常困难的。
It's very difficult to find out the truth without studying carefully.
youdao
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不经过认真研究而要发现事实真相是非常困难的。
It's very difficult to find out the truth without studying carefully.
youdao