You could just see vague blobs of faces.

你只能看到一张张模模糊糊的脸。

《柯林斯英汉双解大词典》

That was also what happened to the study subjects, he said: “You could really see the difference after two hours of running. You could see it in their faces.”

研究中的被试也有相同的体验，博士说：“你的确能在两小时的跑步后发现不同，这点你可以从他们脸上看出。”

youdao

You could see the pride, joy and soul beaming from all the performers' faces.

你能看到所有表演者脸上迸发出的骄傲、欣喜、精神。

youdao

But they never hid their loathing for the proceedings -- you could see it in the faces of the editors as they gave evidence -- and more importantly they never showed a hint of understanding for why they were there.

CNN: Familiar abuse of power as press fights regulation