有用的,用英语说:
helpful、useful
1、几条有用的建议可以让你的旅途更轻松。
Here are some helpful hints to make your journey easier
《柯林斯高阶英汉双解学习词典》
2、她那本《伊万杰琳》后面有许多有用的注解。
Her copy of 《 Evangeline 》 has many helpful notes at the back.
《汉英大词典》
3、我有些可能对你有用的信息。
I have some information you may be able to use.
《牛津高阶英汉双解词典》
4、内存扩充卡是计算机很有用的附件。
The memory expansion cards are useful adjuncts to the computer.