不论如何，尽管不能确定，但尼安得特人很可能在现代人造出第一艘船的很久之前，就已经航海出行了。
In any case, although it's impossible to know for sure, it seems likely that Neanderthals were sailors long before modern humans built their first sea faring vessels.
他不能确定自己理解是否正确，尽管该理论的逻辑推理引起了他的兴趣。
He wasn't sure he'd got it right, although the theory attracted him by its logic.
尽管我们不能确定，然而它似乎是生命力极强的物种。
However, it seems, though we can't be sure, that it's very good at persisting as a population.
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