动词短语
中文翻译：白费力气
同义词：
['waste effort', 'futile effort']
例句：
-
1. We tried to fix the car, but it was a complete waste of time and effort.
我们试图修好这辆车，但完全是浪费时间和努力。
-
2. The project seemed impossible at first, but with persistent effort, we eventually achieved success.
这个项目起初看起来是不可能的，但通过不懈的努力，我们最终取得了成功。
-
3. It's important to recognize that sometimes our efforts may not be in vain, even if they seem likea waste of time.
认识到有时候我们的努力可能不会白费，即使它们似乎是一种浪费。