effort

1. 名词 (energy) 努力 a waste of effort 白费力

2. 名词 (attempt) 尝试 It was a good effort. 这是个很好的尝试。

3. 名词 (physical/mental exertion) 费力 It was an effort to concentrate. 费劲地集中精力。 to make an effort to do sth 努力做某事 with an effort 费力地。