曲率效应和激光作用时间不同是造成上述现象的主要原因。
The main reasons are curvature effects and different laser interacting on times.
造成上述现象的原因是复杂的，既有历史的原因，又有现实的原因。
Contributing to this phenomenon is complex, there are historical and practical reasons.
诗歌来源、作者及创作动因、描写对象等差异是造成上述现象的原因。
The reasons of this organization are source of poems, different social status and motivations of authors, and diff…
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