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more probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds.

参考答案:

解释:句首有一个倒装,正常语序是bird transport is more probable。后面的句子中由于插入部分的频繁出现使句子显得十分凌乱。or联接着两个状语。

译文:
更有可能的是鸟类运输:或者是通过外部途径,即由于种籽偶然粘附在羽毛上;或者是通过内部方式,即由于鸟类吞食果子并随后将种籽排泄出来。

本文来源:http://www.xtoonpix.com/nianzhongzongjie/19546/