Each migration, has an up and down method.

每个迁移都有up和down方法。

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Boxes can be Piled up by side or down side method.

采用侧积盒或机前侧积盒方式。

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Boxes can be Piled up by up side or down side method.

采用侧积盒或机前侧积盒方式。

youdao

Boxes can be Piled up by up side or down side method.

采用侧积盒或机前侧积盒方式。

youdao