七歲的用法和樣例：
例句
-
一個四至七歲的孩子所做的書面作業和任何一個官僚所做的一樣多。
A four-to-seven-year-old does as much paperwork as any bureaucrat. -
七歲的兒童應當識字了。
A seven-year-old (ie A child who is seven years of age) should be able to read. -
他七歲時字就寫得很漂亮了。
By the age of seven he could write beautifully. -
他比我年長七歲。
He is senior to me by seven years.
