第三十用英语怎么说

"How to say 'thirty' in English?"

In English, the number thirty is expressed as "thirty". It is a cardinal number that represents the quantity of three tens or three whole units. This numeral can be used in various contexts where counting or numerical representation is necessary. For instance, in telling time, we use "thirty" to denote the position of the hour hand on a clock face when it points to the number 30. In addition, we also use "thirty" in mathematical equations, such as "x = 30", which means "x is equal to thirty".