这个男孩经历了一次尤其剧烈的突变，他的第五条和第七条染色体各有一个片段互相交换了位置。

He had experienced a particularly dramatic mutation, in which a piece of chromosome 5 had been swapped with a piece of chromosome 7.

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铁轨看似无限靠近，却永无相交之日，让世界大经济体们使用统一会计准则的方案也如铁轨一般，无法消除最重要的差距。

Like railway tracks that appear to converge but never actually intersect, the project to get the world's big economies to use the same accounting standards cannot quite close a vital gap.

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提出了基于形状相似的非相交基元体识别方法。

The shape similarity-based recognition method of non-intersected primitive is proposed.

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