In the hexagonal close packed structure, slip systems are more limited.

在六方密排晶格中，滑移系受到较多的限制。

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This fantastic plastic has molecules far longer than those of regular polyethylene, and these molecules are, in addition, packed tightly into a crystal structure rather than being scattered at random.

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In Brazil, however, a loose federal structure and a constitution packed with fine regulatory detail obstruct reforms.

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ADA2h has two helix-shaped structures called alpha helices that are packed against a flat, sheet-like structure.

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