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Two words may be all the child can master at one time.
二个词也许是所有孩子可能一次能够掌握的。
youdao
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A pair in an output line may consist of two identical words.
一个词对中的两个单词可以相同。
youdao
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A pair in an output line may consist of two identical words.
一个词对中的两个单词可以相同。
youdao