semicentury

例句：

1. 1. The company has been in operation for a semicentury.
   这家公司已经运营了半个世纪。
2. 2. The scientist has made significant contributions to the field of quantum mechanics over the past half century.
   这位科学家在过去半个世纪里对量子力学领域做出了重大贡献。
3. 3. The museum is celebrating its centennial anniversary this year.
   今年，这家博物馆正在庆祝它的百周年纪念。