She made helpful comments on my work.
她对我的工作提出了有益的意见。
Role-play is helpful in developing communication skills.
角色扮演有助于提高沟通技巧。
Sorry I can't be more helpful.
对不起，我帮不上更多的'忙。
Parents often feel helpless, knowing that all the hugs in the world won't stop the tears.
家长们常常感到无能为力，知道世上所有的拥抱也不能止住眼泪。