wasted effort造句

I felt chagrined at the wasted effort.

He argues that having turbines blowing aimlessly in the wind isn't necessarily wasted effort - if your intent is to build an industry.

Patterns and principles are useful because they help us avoid wasted effort of continually examining first assumptions and reinventing the wheel.

Hitherto, and it has not been wasted effort, people have played on words and pretended to believe that refusing to grant a meaning to life necessarily leads to declaring that it is not worth living.