要看具体的语言环境了,例如：
Today is his 40th birthday .
今天是他40岁生日.
这里的40th 可以当40岁讲. 要看具体的语言环境了,例如：
Today is his 40th birthday .
今天是他40岁生日.
这里的40th 可以当40岁讲.