这些问题既有复杂的历史背景，也有诸多的现实原因。
These issues have both complicated historical background and many practical reasons.
其思潮和社会潮流，本来就是有着深远传统基础和现实原因。
This trend of thought and society tidal current have deep tradition basic and realism reason.
该现象形成的原因较为复杂，既有历史原因，也有现实原因。
The cause to form it is very complex, of both historic and real present.
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