例句：

　　She made helpful comments on my work.

　　她對我的工作提出了有益的意見(jiàn)

　　She helpfully suggested that I try the local library.

　　她很熱心地建議我試試本地的圖書(shū)館。

　　The worst part is being helpless to change anything.

　　最糟糕的是沒(méi)有能力改變任何事情。

　　They helplessly watch the crops being flooded.

　　他們眼睜睜地看著(zhù)莊稼被水淹了。

　　Secondly, the feature matching of image is explored helpfully.

　　然后，在圖像特征匹配方面做了有益的探索。