My son's thirteen but he's young for his age.

　　我兒子十三歲了，但他比實(shí)際年齡顯得小。

　　Thirteen is often considered an unlucky number.

　　十三常被認(rèn)為是不吉利的數(shù)字。

　　During the expedition, they trekked ten to thirteen hours a day.

　　在探險(xiǎn)期間，他們每天都要走十到十三個(gè)小時(shí)。

　　She was baptized when she was a month old and confirmed when she was thirteen.

　　她出生一個(gè)月時(shí)受洗禮，十三歲時(shí)受堅(jiān)信禮。

　　He was one of thirteen children from a poor family.

　　他是13名來自貧困家庭的孩子之一。