We all gain a lot of experience as we grow old.

He always maintains an attitude of attention.

Everyone, attention!

Always be careful when crossing the road.

He is good at fudging the numbers.

He continued to hide his talents as if to hide his light and conceal his tracks.

He is the type of person who understands ten from hearing one.

He chose to discard the shadow for the substance.

He took action to stir up unnecessary problems, like poking a bush and bringing out a snake.

He was complaining that the exam was difficult.