用英语怎么说45年

45 years in English can be translated as "forty-five years." The number "45" is a cardinal number, which means it is used to count things (e.g., one apple, two apples). The word "years" is a plural noun that refers to a unit of time equal to 365 or 366 days, depending on whether it is a leap year.
The word "forty-five" is a compound number, which is made up of two words: "forty" and "five." The word "forty" comes from the Old English word "feowertig," which is derived from the Proto-Germanic word "faurtigaz," meaning "four times ten." The word "five" comes from the Old English word "fif," which is derived from the Proto-Germanic word "fimf," meaning "one left."
Here are some examples of how "forty-five years" can be used in a sentence:
She has been married for forty-five years. (她已经结婚45年了。)
He has been working at the company for forty-five years. (他在公司工作了45年。)
The house has been in their family for forty-five years. (这房子在他们家族里已经有45年了。)