Severe exertion, physical or mental, made for a definite end.

奋力；努力。

Something produced by such exertion, as a literary produced.

努力成果；作品(如文学作品)。

Attempt.

努力尝试。

Effort stresses the power or strength, physical or mental, put forth.

Efforts 强调所用之体力或智力：

Attempt emphasizes the idea of trying to accomplish a definite end, and admits the possibility of failure.

Attempt 着重奋勉以达目的之意，但含有失败之可能：

An endeavor is a continued or successive series of efforts or attempts directed steadily toward a general aim.

Endeavor 指努力奋勉，用继续不断之 efforts 或 attempts 以赴目的：