You can't use numbers with them at all.

你不能在它们之前加任何的数词。

Oh! Clever! Playing on the use of cardinal numbers as euphemisms for bodily functions.

行啊你！用基数词做文章来委婉表达人体机能。

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

而 fiftith 才是序数词的正确写法。

You can't use articles like 'a' or 'an' with them and can't use numbers.

你不能用冠词比如'a' or 'an'修饰它们，数词也不可以。

Ordinal numbers are numbers that show the order of things.

序数词表示的是事物的顺序。

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

家会看到数字出现在这里，它会是一个序数词。

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

当你在给某些事物排序时，那么这时序数词像是，，作为冠词使用。

All of the other ordinal numbers end in a TH.

所有其他以TH结尾的序数词。

You will learn how subjects such as ordinal numbers and sentence fragments help describe the events and results of the competitions.

你将了解如何使用序数词和句子成分述比赛和结果。

Fifth has a short 'i' sound for the ordinal numbers.

的序数词发音有一个短促的'i'音。

Ordinal numbers refer to the order or position of something in a list.

序数词指的是某物在列表中的顺序或位置。

So that's the base number, like 1, 2, 10, 5. That's a cardinal number.

那么这就是基数词，比如1、2、10、5。这就是基数词。

Now, the word ordinal number, that's when you're adding 3rd, 4th, 5th, 6th, 21st, 22nd.

现在，序数词这个词指的是添加3、4、5、6、21、22这样的词。

Ronnie's not taking this because " vocabulary" is what we see in English is uncountable.

因为“词汇” 是我们在英语中看到的不可数词。

Read the sentences below about LiMengtian and pay attention to the use of ordinal numbers.

阅读以下关于李梦天的句子，并注意序数词的使用。

We form most ordinal numbers by adding -th to the cardinal numbers.

我们通过在基数词后加 -th 来构成多数序数词。

" twenty-third." All of these are examples of ordinal numbers.

“十” “十三” 。 这些都是序数词的例子。

There's first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth – those are ordinal numbers.

有一、、三、四、、六、七、八、九、十——这些都是序数词。

The word that comes before the word " straight" is what we call an " ordinal number."

在单词" straight" 前面的词我们称之为“序数词” 。

The worst student would be " last." So the term " last" is also ordinal in that sense.

最差的学就是“最后” 。 所以从这个意义上说， “最后” 也是一个序数词。