1.he believes that this very difficulty may have had the compensating advantage of forcing him to think long and intently about every sentence, and thus enabling him to detect errors in reasoning and in his own observations.

　　他相信，正是这种困难或许能够扬长避短，以使他能长时间专注的思考每一个句子；因此，使他能在推理中和自己的观察中发现自己的缺点。

　　2.He asserts, also, that his power to follow a long and purely abstract train of thought was very limited, for which reason he felt certain that he never could have succeeded .

　　他还断言，在深入理解冗长且完全抽象的观点上，他的能力受到了局限。有鉴于此，他曾确信自己在数学方面本来就不该获得成功。

　　3.On the other hand, he did not accept as well founded the charge made by some of his critics that, while he was a good observer, he had no power of reasoning.

　　另一方面，批评家指责他尽管善于观察，但无法推理，对此，他并不接受且认为观点不成立。

　　4. He adds humbly that perhaps he was "superior to the common run of men in noticing things which easily escape attention, and in observing them carefully."

　　他谦卑地补充道，或许他“和普通人比起来，更能够注意到那些别人不容易注意到的东西，更能够对此加以详细地观察”。

　　5.Darwin was convinced that the loss of these tastes was not only a loss of happiness, but might possibly be injurious to the intellect, and more probably to the moral character.

　　达尔文认为，失去对音乐和绘画方面的兴趣，不仅失去了幸福，而且还可能损伤智力，甚至可能会伤害道德。