Ornamental trees and bushes or shrubs can serve other useful purposes besides just looking good.

VOA: special.2011.04.19

So, a natural product is something that is made by nature, and often natural products, whether it comes from a plant or a marine organism have some really good, useful properties. And so, one particular compound has anti-tumor properties. So, again, along this line of cancer research.

天然产物是在自然界中生成的,通常一个天然产物，不管是来自植物或者海洋生物,都有些非常好非常实用的性质，其中的一个特殊的化合物,可以治疗癌症,再一次我们又来到癌症研究上。

麻省理工公开课 - 化学原理课程节选

English is a very good language to learn and it's very useful,

英语是一门值得学习的语言，它非常地实用，

要继续努力 - SpeakingMax英语口语达人

I think for the moment it should be plain to you that this is a good way of understanding what the difference between a useful preconception and a useless preconception brought to bear on an interpretative act might consist in.

我想大家现在都能够,从这个例子中明白,解读中有益先见,和无益先见,之间的区别了。

耶鲁公开课 - 文学理论导论课程节选

And I think "I'm good at" is useful for when you're talking about yourself, "I am."

当你在谈论自己的时候，你可以使用“I'm good at”句型，即“I am”。

I'm good at 课堂 - SpeakingMax英语口语达人

I'm good at" is so useful when you want to talk highly of yourself.

当你想夸赞自己时，“I'm good at”句型非常有用。

I'm good at 课堂 - SpeakingMax英语口语达人