Ordinal numbers also can act as adverbs.

序数也当副词。

We use ordinal numbers to see which comes first.

当我们看哪个先的时候，使用序数。

And fiftieth is the correct way to write the ordinal number.

而 fiftith 才序数词的正确写法。

You'll see a number up here, it'll be an ordinal number.

大家会看到数字出现在这里，会一个序数词。

Finally, you might also hear ordinal numbers used as an adjective.

最后，你能还会听到序数用作形容词。

It's very rare to see an unabbreviated ordinal number in a written date.

我们非常常用这种写法当我们在写整个日期的时候。

Ordinal numbers are numbers that show the order of things.

序数词表示的的顺序。

All of the other ordinal numbers end in a TH.

所有其他TH结尾的序数词。

Yes, he did. Lucky him! And ordinal numbers are different to cardinal numbers.

的哟。他真幸运！序数词和基数词不同的。

In both cases, the ordinal number is acting like a noun.

在这两个例子中，序数的作用都像一个名词。

Ordinal numbers are one important area of grammar that connects with the Olympics.

序数与奥运会相关的一个重要语法领域。

We often use the word the with ordinal numbers, but we can also use possessives.

我们经常把 the 和序数词连用，但所有格也。

But in the Olympic games, ordinal numbers are of central importance.

但在奥运会上，序数才最重要的。

Ordinal numbers tell us the position of something in a group — the dates in a month, for example.

序数告诉我们某在一组中的位置——例如一个月中的某一天。

That's right. Now the twenty-fifth is an ordinal number like the first and the second.

没错。The twenty-fifth 一个序数词，就像 the first 和 the second 一样。

Ordinal numbers can act as nouns, adjectives, or adverbs.

序数当名词、形容词或副词。

When you're ordering things, so when ordinal numbers like second, fifth, are used as adjectives.

当你在给某些排序时，那么这时序数词像第二，第五，作为冠词使用。

The three most important ordinal numbers in the Olympics are first, second, and third.

奥运会上最重要的三个序号第一、第二和第三。

So, now we have two more ways of using ordinal numbers: space and quality.

空间和特性。

Ordinal numbers suggest an order of things – think the order of winners in the Olympics.

序数代表的顺序--想想奥运会获胜者的顺序。