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I think maybe it's because they didn't have the concepts down.
我想可能是因为,当时的人们并没有理论体系的支撑
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$firstVoiceSent
- 来自原声例句
I think maybe it's because they didn't have the concepts down.
我想可能是因为,当时的人们并没有理论体系的支撑
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