Not only must I think of my fish all night, studying, without the object before me, what this unknown but most visible feature might be, but also, without reviewing my discoveries, I must give an exact account of them the next day.

• 我不但必须整夜去想那条鱼，鱼不在跟前得反复琢磨出那未知而又极其明显的特征是什么，而且在无法重温已经发现的特征的情况下，还要在第二天准确地把那些特征描述出来。