a. providing assistance or serving a useful function
a. 有帮助的, 有益的, 有用的
1. The instructions were very helpful for understanding the new software.
这些说明对理解新软件非常有帮助。
2. It is helpful to review your notes before the exam.
考前复习你的笔记是很有帮助的。
3. She gave me helpful advice on how to improve my writing.
她给了我有帮助的建议，告诉我如何提高写作。