There is a not a lot of science behind these models other then taking an iterative approach; there is no beginning and no end.

这些模型的背后不是采用了许多科学技术，而是采用了迭代的方法；没有开始和结束。

youdao

It had no beginning and no end.

它没有开始也没有结束。

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"We find no sign of a beginning," he wrote, "no prospect for an end." His colleague and friend John Playfair commented that "the mind seemed to grow giddy by looking so far into the abyss of time."

“我们没有发现开始的标志，”他写道，“也没有发现要结束的迹象”，他的同事兼朋友约翰·普莱·费尔评论说，“向时间的深渊里这样遥望让人几乎晕眩了。”

youdao

That chain is in a circle that goes round and round, with no beginning and no end.

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If there is no beginning and end to conflict, it no longer makes sense to differentiate between development as conflict-prevention and humanitarian aid as conflict-relief.

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The end is no longer the end, but the beginning of the finale, which involves the entire cast leading an all singing, all dancing swing-a-long to the show's most famous numbers.

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