Ford kept his suspicions to himself, even to the extent of going to jail for a murder he obviously didn't commit.

福特把自己的怀疑藏在心里，即使到了要为他显然没有犯的谋杀罪而入狱的地步他也不说。

《柯林斯英汉双解大词典》

He was a quiet man who always kept to himself.

他不爱说话，总是独来独往。

《柯林斯英汉双解大词典》

Even when Sasuke was asleep with his head on Itachi's shoulder, he kept the words to himself.

即使佐助把头靠在鼬的肩膀上睡着了，他也把这句话藏在心里。

youdao

He kept a gun--a rifle for hunting to support himself.

VOA: special.2009.10.31

He kept himself solitary and chaste. He devoted himself to poetry.

他过着孤独朴素的生活，致力于诗歌创作。

耶鲁公开课 - 弥尔顿课程节选

The notion of a self-assured experimenter-- The results would be very different if the experimenter himself seemed nervous, unwilling to proceed, confused, but he was confident and he kept saying that he will take responsibility.

还有电击者的自信程度-,实验结果会大为不同，如果电击者,紧张，不愿进行电击，迷惑，但电击者很有信心，不停地说,他会承担责任。

耶鲁公开课 - 心理学导论课程节选

Why would he speak about it now when he had kept it to himself for almost four decades?

CNN: A daughter faces demons of father's war

The public praise also insured that he kept to himself his ambivalence about the way Lish had edited some of the stories.

NEWYORKER: Rough Crossings

Julian was a thin man of sixty-three, balding, a typewriter repairman who worked out of his spare bedroom and kept to himself.

NEWYORKER: Idols