白费力气

• He tried in vain to catch the butterfly on the flower
  他白费力气想抓住停在花上的蝴蝶。
• Dante : you ' re wasting your time , buddy
  但丁：你是在白费力气，老兄。
• Henry tried to pull the heavy cart , but to no avail
  亨利想拖动那辆沉重的车子，但白费力气。
• It is of no use boasting of being rich on a desert island
  在无人岛上夸耀富有也是白费力气。
• Trying to hit a humbug was a waste of effort
  想打一个欺骗兽就跟想跟他们说话一样是白费力气。
• It was in vain that we tried to make him change his mind
  我们设法使他改变主意，但白费力气。
• What they have done is of no avail
  他们刚刚作的都是白费力气！
• Learning without thought is labour lost
  学而不思，白费力气。
• It is no use crying about the past
  过去的事哭也是白费力气。
• [ echoing ] you ' re wasting your time here
  你是在白费力气