n.

1. 努力，尽力[U][C][+to-v]
   I decided to make one more effort.

   我决定再作一次努力。

   His efforts had no smallest chance of success.

   他的努力毫无成功的希望。

2. 努力的成果；成就[C]
   His recent novel is a fine literary effort.

   他新近的小说是一本文学佳作。

n.

1. a vigorous or determined attempt.
   ▸strenuous physical or mental exertion.
2. technical a force exerted by a machine or in a process.