A crowd of people looked on [=stood by] helplessly as the house burned to the ground.一群人束手无策地站在旁边眼看着房子被烧毁。

I've always looked on her as a friend. [=considered her to be a friend]我一直把她当朋友。

They looked on reading as an escape from the troubles of life.他们把阅读当作一种摆脱生活烦恼的方法。

He looked upon his son's accomplishments with pride.他为儿子的成就感到自豪。