The library of Earth is an old one.

地球像是一个古老的图书馆。

The expression is an old one.

这一表达历史悠久。

Is the family an old one? -Older than yours, I imagine.

这个家族有历史吗？-我想比你家历史久远。

Two bulls! A young one and an old one.

两头公牛！一头年轻，一头年老。

Wow, that is an old one! Look at that. 1925.

很旧的一本！看1925年的。

An old one from one of the trucks or something?

比如那些卡车上拆下来的旧轮胎？

A new political tone seems to be coinciding with an old one.

新的政治基调似乎与旧的一致。

The results can be bland and look artificial but that authenticity problem is an old one.

结果可能平淡无奇，看起来做作，但真实性是一个老问题。

This popular saying is an old one. It comes from the 18th century English poet Alexander Pope.

这是一句古老的常用谚语。它出自18世纪英国诗人亚历山大·蒲柏。

Black eyeliner can look a little harsh though so I am using an old one that's almost out of ink.

黑色的眼线笔颜色可能会过深，所以我用的是快用完墨水的眼线笔。

He treats me as an old one of no importance!

他把我当作一个无关紧要的老人！

An old one and a young one.

一老一小。

And use an old one for more interesting results.

用老式相机会照出奇妙的效果。

This was not a new thought, but quite an old one, by this time.

这不是一个新想法，而是一个相当古老的想法。

I'm guessing a young horse makes a better gift than an old one.

我猜一匹年轻的马比一匹老马更适合作为礼物。

You want to dust off an old one for us?

你想不想帮我们热个场？

That's not a new idea. It's an old one.

这并非新的思想 而是个老的。

Oh, my, she's an old one.

那她可是只老妖。

She's an old one, isn't she?

她是始祖之一 是不是？

Although I have never given or received a horse, I'm guessing a young horse makes a better gift than an old one.

尽管我从来没有赠送或者收到过一匹马，但我猜一匹小马比一匹老马会更适合做礼物。