30的英语怎么说

The English expression for "30" is simply "thirty". This word is used to represent the numerical value of 30 in all contexts where numbers are required, such as in counting, time measurement, or quantity representation. It follows the standard English numbering system, where "one" represents 1, "two" represents 2, and so on. Therefore, when asked how to say "30" in English, the answer is always "thirty".