He kept his head down, hiding his features.

他一直低着头藏住脸。

《柯林斯英汉双解大词典》

He stood right before me with his head down and said excitedly, "Look, what I've found!"

他就站在我面前，低着头兴奋地说：“看，我找到了什么！”

youdao

Matt Hunt said he was "very proud" of his son because when the boy gets an idea, he keeps his head down and gets on with it, and he really does want to do some good and stop young kids from getting asthma.

马特·亨特表示，他对儿子感到“非常自豪”，因为当他有想法时，他会埋头坚持下去，他真的想做一些好事，让孩子们不再染上哮喘。

youdao

He shook his head. Soon he was walking down the street where he lived.

VOA: special.2009.04.04

You saw that in the way he stood bobbing his head, always looking down, nodding like a young boxer to instructions to make you think he was listening to every word, throwing in a thousand "yes"es and "that's right."

你看他站着摇头晃脑的样子，总是朝下看，像年轻的拳击手听指令时一样,那样晃着脑袋，好让你觉得他在听你说的每个字，一边不断附和着“是““对“

耶鲁公开课 - 1945年后的美国小说课程节选

She would bring all of Comus' magic structures down around his head.

她将能解除科玛斯的所有魔力。

耶鲁公开课 - 弥尔顿课程节选

He kept his head down, and focused on what he loves: music by Chopin.

NPR: Rafal Blechacz's Single-Minded Chopin

As the rest of the group abandoned the race, Phinney put his head down and pedaled.

WSJ: Taylor Phinney: This Is Not a Story About Last Place��Jason Gay

He's been described as someone who keeps his head down and does his homework.

FORBES: Obama reportedly goes for change--and experience.