He can't speak because of a throat infection.

他嗓子发炎不能说话。

《牛津词典》

When you develop a throat infection or catch a cold the glands in the neck swell up.

当你咽喉发炎或感冒时, 脖子上的腺体会肿起来。

《柯林斯英汉双解大词典》

He was fighting a throat infection.

他正在与咽部感染作斗争。

youdao

Diana Vickers made her return to the stage after missing last week's live show due to a throat infection.

BBC: Daniel Evans gets X Factor boot

George Washington developed a throat infection at home on December 13, 1799, that killed him by the next evening.

NEWYORKER: Letting Go

Washington enjoyed less than three years of retirement at Mount Vernon, for he died of a throat infection December 14, 1799.

WHITEHOUSE: George Washington