You can't use numbers with them at all.

你不能在们之前加任何数词。

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 才序数词正确写法。

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'们，数词也不可以。

Ordinal numbers are numbers that show the order of things.

序数词表示物顺序。

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。

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

当你在给某些物排序时，那么这时序数词像第二，第五，作为冠词使用。

All of the other ordinal numbers end in a TH.

所有其他以TH结尾序数词。

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.

第五序数词发音有一个短促'i'音。

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

序数词指某物在列表中顺序或位置。

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

那么这就基数词，比如1、2、10、5。这就基数词。

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

现在，序数词这个词指添加第3、第4、第5、第6、第21、第22这样词。

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

因为“词汇” 我们在英语中看到不可数词。

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

阅读以下关于李梦天句子，并注意序数词使用。

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

我们通过在基数词后加 -th 来构成大多数序数词。

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

“第二十二” “第二十三” 。 这些都序数词例子。

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

有第一、第二、第三、第四、第五、第六、第七、第八、第九、第十——这些都序数词。

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

在单词" straight" 前面词我们称之为“序数词” 。

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

最差学生就“最后” 。 所以从这个意义上说， “最后” 也一个序数词。