He had tried to cogitate and to discipline himself to study.

他曾试图沉思并训练自己去学习。

Nor could he even cogitate upon the strong, true purpose and draw strength from that.

他甚至无法思强大的、真正的目的并从中汲取力量。

He was silent for a little, tapping his teeth with his pipe as was his habit when cogitating.

他沉默了一会，用烟斗敲打着牙齿，这他沉思时的习惯。

The old bitterness came up in him and he did not have time to cogitate and push it down.

旧日的苦涩涌上头， 他来不及思抑。

If you hesitate and cogitate, you will come up with another word—of course you will, there's always another word—but it probably won't be as good as your first one, or as close to what you really mean.

如果你犹豫不决再三思索，你定会想出另外一个词——当然你能，总会有另外的词可以选用一担很可能这个词不如你想到的第一个，或者这词不如第一个意思准确。

The quiet insolence of the white race was one thing he had tried to keep out of his mind for years. When the resentment would come to him he would cogitate and study.

白种人的无礼无礼他多年来一直试图不去想的一件事。当怨恨来临时，他会沉思研究。