这似乎是合理的，但它仍然是一种理论，这个理论是基于我们对陆生动物的更全面的认识。
Plausible as this seems, it is still a theory and based on our more comprehensive knowledge of land-based animals.
这主要基于杰斐逊对自己实力的估计和对现实的清醒认识。
The main reason was based on the correct consideration of the strength of his own country and the sober consciousness of the reality.
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