She made helpful comments on my work.
她對我的工作提出了有益的意見。
Role-play is helpful in developing communication skills.
角色扮演有助于提高溝通技巧。
Sorry I can't be more helpful.
對不起，我幫不上更多的忙。
Parents often feel helpless, knowing that all the hugs in the world won't stop the tears.
家長們常常感到無能為力，知道世上所有的擁抱也不能止住眼淚。