He had lost the power of speech.

他丧失了语言能力。

《牛津词典》

I seemed to have lost the power of speech.

我好像话都说不出来了。

《牛津词典》

He lost his power of speech.

他失去了说话的能力。

youdao

The case won him fame for his power of speech.

VOA: special.2009.04.24

He's not saying that it is because we are rational creatures possessed of the power of speech that causes us to engage in politics.

他并不是在说,因为我们是理性生物,且具有辩论能力,所以才会导致我们参与政治。

耶鲁公开课 - 政治哲学导论课程节选

He says man is political not because we have some biological impulse or instinct that drives us to participate in politics, but, he says, because we are possessed of the power of speech.

他说人类具有政治性,但不是因为,我们拥有某种生物冲动或本能,驱使我们参与政治，而是因为我们掌握了,辩论的能力。

耶鲁公开课 - 政治哲学导论课程节选

Josie soon went back to school, and gradually, with the help of a special therapist and other teachers she partially regained the power of speech.

BBC: Josie's long journey

Thus, after noting the Estonian language's "primitive cast, " Mr. Theroux turns his attention to Lord Monboddo, an 18th-century sage who believed that apes were essentially humans without the power of speech, enjoyably esoteric information that tells us little about Estonia but a lot about Mr. Theroux's magpie mind.

WSJ: Book Review: Estonia

Rather than dwell on the old performance metric of speed, Otellini, in his first Intel Developer Forum speech as CEO, focused on power consumption and heat dissipation of semiconductors.

FORBES: Chief Executive Paul Otellini