你还需要导入ecore, ws和ut il实用程序包，它们被用来加载模型(将在下一步中作解释)并导入特殊结构。
You also need to import the ecore, ws, and util utility packages, used to load the models (as explained in the next step) and import special constructs.
这是另一个模型层次结构(接下来将解释)的一部分。
但即便这一圆环结构最后被证实果真是大爆炸之前的遗迹，循环宇宙的想法可能也未必是最完美的模型解释。
But even if the circles really do stem from sources in a pre-Big Bang era, cyclic cosmology may not offer the best explanation for them.
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