Data supplement

(singing. ) is a grammatical symbol in English, which is the abbreviation of singular nouns, (often singing) is a common singular, and (singing). Same as pl. ) is a singular and plural homonym. (pl。 ) is a plural noun.

The singular is one, nouns mean that all objects with names can be called nouns, and singular nouns mean objects with a number of one, such as cars, books and so on. Generally, a can be used to modify and explain; For example: acar. Use an before the word at the beginning of vowel pronunciation, for example, anelephant.

The rules of changing English nouns from singular to plural;

The plural form of most countable nouns is the suffix -s at the end. Any word ending in s, z, x, ch and sh, with the trailing -es at the end of the word, forms the plural. For nouns ending in consonant +y, change y to I, and then -es.

For nouns ending in -o, if they are not foreign words or abbreviations, add -es, otherwise add -s to form a plural. Nouns ending in -f or -fe are mostly changed from f or -fe to -ves, but there are exceptions.

The plural forms of some words are unchanged, while the plural forms of a few words are irregular. Some singular words need to be added with en to become plural, and some singular words need to be changed to become plural. Example: bus → bus; Fox → ox; Matches → matches; Flash → flash.

Mathematically, the singular number is defined as:

Mathematical correction of odd numbers, such as 1, 3, 5, 7, 9, etc. In mathematics, the odd number is opposite to the even number (positive even number) and can be expressed as 2n+ 1 (n is an integer greater than or equal to 0).

Mathematically, the complex number is defined as:

A number in the form of z=a+bi(a and b are real numbers) is called a complex number. Where a is called the real part, b is called the imaginary part, and I is called the imaginary part.