每一个盒状结构交替留有一个空的空间，大小完全一样。

Each of these box-like structures alternated with an empty space, of exactly the same size.

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形成泡沫状石膏浆料后再灌入芯盒。

Secondly, foamy plaster material was put into core box.

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形成泡沫状石膏浆料后再灌入芯盒。

Secondly, foamy plaster material was put into core box.

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