Fold the letter AD put it into the envelope and then close it.

把信折叠起来并且把它放进信封并且关上信封。

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In close contact with three smooth, is strictly prohibited in a gap between fold.

三者依次平稳紧密接触，中间严禁有间隙式褶皱。

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In close contact with three smooth, is strictly prohibited in a gap between fold.

三者依次平稳紧密接触，中间严禁有间隙式褶皱。

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