He felt the necessity of closing my mouth against the crime he knew he was committing.

他觉得有必要让我闭嘴反对他知道自己正在犯下的罪行。

And yet, as he felt the necessity of responding to her look of inquiry, the smile disappeared.

然而，当他觉得有必要回应她询问的表情时，笑容消失了。

It was for this last reason, for that matter, that I felt the necessity of communicating these memoirs to her.

正是出于最后一个原因， 就此而言，我觉得有必要将这些回忆录传达给她。

The admirable common-sense which guided all the actions of these great machinators made each side feel the necessity of a momentary alliance against a common enemy.

指导这些伟大的阴谋家的所有行动的令人钦佩的常识使每一方都感到有必要暂时结成联盟来对抗共同的敌人。