英语翻译49.He adds humbly that perhaps he was “superior to the c

英语翻译49.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.参考译文：达尔文很谦虚的补充到,有些事情需要高度的注意力和细心的观察,也许他自己在观察此类事情时比一般人有优势.其中 which easily escape attention如何理解?