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effort 
  n 
1 u  (energy) 努 力 [nŭlì] 
a waste of effort  白 费 力 
2 c  (attempt) 尝 试 [chángshì] 
It was a good effort.  这 是 个 很 好 的 尝 试 。 
3 u/s  (physical/mental exertion) 费 力 [fèilì] 
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