He remained silent for some time.

他好长时间都保持沉默。

《柯林斯英汉双解大词典》

Tom was surprised at his act, but he remained silent.

汤姆对他的行为感到惊讶，但他仍然保持沉默。

youdao

Thinking that he had fallen asleep, she remained silent.

她以为他睡着了，于是保持沉默。

youdao

He remained silent for a year and decided to speak out after my case hit the news.

CENTERFORSECURITYPOLICY: Center For Security Policy

He had acted as roving cultural ambassador for Biafra at the time, but for more than 40 years he remained silent about his war experiences.

BBC: Chinua Achebe: Obituary of Nigeria's renowned author

But when Carlos Alberto Renteria, the man accused of heading the Colombian Norte del Valle drug cartel was extradited, he remained silent with his head bowed, denying the cameras the chance to take images of his face.

BBC: Venezuela hands over alleged Colombian drug lord to US