A barometer is useful in predicting the weather.

气压计在预测天气方面很有用。

On balance, I hold the contention that exams are useful rather than harmful.

我认为，考试很有用。

Sometimes the vending machine is a friend.

有时候自动售货机真的很有用。

Shoestrings are very useful for keeping our shoes on.

鞋带对我们穿鞋很有用。

Yeah, it's very useful for me as well.

是啊，对我来说也很有用。

Give it a try, it really works.

试试吧，真的很有用。

Visual aids can be useful for learning.

视觉辅助对学习很有用。

Do you think I'd find that useful?

你觉得我会认为那很有用？

These are intermediate words and they are useful.

这些都是中级词，它们很有用。

So, notice phrasal verbs, they're useful, okay?

注意动词短语，它们很有用。

Thanks a lot. They'll be very useful.

非常感谢，这很有用。

The site is useful for the public as well.

这个网站对公众也很有用。

We could always use a man like you, Nathan.

你对我们很有用，奈森。

And so I thought it is useful.

所以我认为有目标很有用。

You can imagine gardening gloves are useful.

你可以想到园艺手套很有用。

I'm telling you, this is gonna work.

我告诉你，这很有用。

They're are useful when you're selling a product, and they're also useful for selling your ideas.

它们在你销售产品时会很有用，在销售你的想法时也很有用。

But candles are useful as well.

但蜡烛也很有用。

Enjoyed it, it was very useful.

很喜欢，很有用。

Although that can be useful for a beginner.

虽然这对初学者很有用。