What they all have in common is that they combine fun with opportunity t learn something.

它们的共同点是，他们将不好玩的机会学到些东西。

youdao

Does anyone have that in their brain somewhere for ready use? I don't, in fact, so it's actually okay if you don't know all your common ions, if you missed that part.

你们有谁有印象它们有什么用吗？,我当时是不知道，所以如果你们不记得,这部分也没有关系。

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