这样，就在脐部形成一个薄弱的环口。

In this way, in the umbilical ring to form a weak mouth.

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多氮杂大环与许多金属离子能形成稳定的络合物。

Polyazamacrocycles are known to form stable metal chelate complexes.

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多氮杂大环与许多金属离子能形成稳定的络合物。

Polyazamacrocycles are known to form stable metal chelate complexes.

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