S-2：see something with half an eye 不费力气看出

A:You're in love with Mary, right?

A:你爱上了玛丽，对吗?

B:You're pulling my legs!

B:别开玩笑了!

A:I'm not blind. Anyone can see that with half an eye.

A:我眼睛可不瞎，谁都能毫不费力地看出来。