I think my notes should be helpful.我觉得我的笔记该有用的。

You have been very helpful since my arrival here.自从我来到这里，你对我的帮助很大。

Group mails to family and friends are also helpful and efficient.给亲朋好友群发邮件也是个实用而有效的办法。

It was not an idol, but more of a landing pad to attract helpful ETs.它并非一个偶像，倒更像是个吸引前来帮助的外星人的降落台。

They should give you helpful feedback to make your project the best it can be.他们会尽最大努力给你的方案提出很有帮助的反馈意见。

As a parent, you can play a helpful role in assisting your child search for jobs.作为父母，在子女找工作中，你可以起到很有帮助的辅助作用。

He says he believes open source software could be helpful for students like himself.他说他相信开源软件对象他这样的学生来说是很有帮助的。