We used to mistake that heavy objects fell faster than light ones.

我们过去错误地认为重的物体比轻的物体下落更快。

youdao

Then I try a very delicate butterfly pendant and bracelet that are so feather-light, I almost shoplift them by mistake.

于是我又试了一个精巧的蝴蝶结和手镯，这两样东西简直轻如羽毛，我几乎顺手牵羊将它们偷走。

youdao

He once tried to put in a brighter light in his bedroom, but he made a mistake. Then his whole house had a power cut.

曾经有一次他试图在他的卧室里安装一盏更亮的灯；但是他犯了一个错误，整个房间都停电了；

youdao

How would you like a job where, every time you make a mistake, a big red light goes on and 18, 000 people boo?

FORBES: Magazine Article

Friends of the Earth said "a green light for shale gas would be a costly mistake for our country and countryside".

BBC: Autumn statement: A future for shale gas in Wales?

Tell them that it was a mistake for Google not to put a red light indicating that a photo or video is being taken, and that you hope there will be one in future iterations (even though evil folk may find a way to somehow disable the light).

WSJ: Google Glass: An Etiquette Guide