“一百年”常见的英文表达是 a hundred years 或 one hundred years,二者意思相近,在日常交流和书面写作中均可使用。例如:
It has been a hundred years since the founding of this company.(这家公司自成立以来已经有一百年了。)
One hundred years have passed, and this old building still stands here.(一百年过去了,这座老建筑依然矗立在这里。 )