例句：
She made helpful comments on my work.
她对我的工作提出了有益的意见
She helpfully suggested that I try the local library.
她很热心地建议我试试本地的图书馆。
The worst part is being helpless to change anything.
最糟糕的'是没有能力改变任何事情。
They helplessly watch the crops being flooded.
他们眼睁睁地看着庄稼被水淹了。
Secondly, the feature matching of image is explored helpfully.
然后，在图像特征匹配方面做了有益的探索。
