Its British pronunciation is [? na？ Enti. n]； The American pronunciation is [? na？ Enti. n].
The so-called cardinal number is mathematically understood as a number with comparable size. Primitive words in English are used to describe the quantity of things. Therefore, the definition of cardinality is: the number describing the number of things is called cardinality.
Related examples:
He lived in Shanghai until 19 years old.
He lived in Shanghai until he was nineteen.
This little villain is only 19 years old.
That hooligan is only nineteen years old.
Extended data:
First, the cardinal word memory formula.
Primitive words are easy. Words from 0 to 12 are different, so remember them separately.
13 to 19, don't end with teen.
From 20 to 90, there is a ty after the whole ten.
Dozens, which is also very simple: say dozens first, then a few, with a short bar "-"in the middle.
Happiness is one hundred, and the number within one hundred is kept in mind.
Hundreds, very simple: say hundreds first, then a few, and add in the middle.
Thousands are thousands, and the number within a thousand is recorded in your heart.
Second, the expression form of cardinal words
1, from 1- 10?
One, two, three, four, five, six, seven, eight, nine, ten.
2. From11—19?
Eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen.
Except eleven, twelve, thirteen, five and eighteen are special forms, fourteen, sixteen, seventeen and nineteen are all composed of their single-digit forms followed by the suffix -teen.
3. From 20 to 99?
Except for twenty, thirty, forty, fifty and eighty, which are special forms of dozens of integers, six, seventy and ninety are all single-digit forms, plus the suffix -ty. When it represents dozens, add a hyphen "-"between dozens and the unit cardinal word form.
4. Add "one percent" to the hundredth, and add the sum between tens and hundreds, such as: 10 1 one percent, 320,320,648,648.
5, thousands of digits or more, counting from the right end to the left end of the number, add a comma ","every three digits. Starting from the right, the number before the first ","is thousands, the number before the second ","is millions, and the number before the third ","is millions. Then, section by section, the maximum number between two commas is in hundreds.
Baidu Encyclopedia-Basic Vocabulary