Because this topic is complex, we've split the information into two parts.

因为这个主题很复杂，所以我们分两部分来讲述这方面的信息。

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Only later do they split open into more complex shapes.

随后它们裂开，变成更为复杂的结构。

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Only later do they split open into more complex shapes.

随后它们裂开，变成更为复杂的结构。

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