n.十三;十三岁;十三个;
num.十三;
例句:
Beijing is thirteen hours ahead of New York.
北京比纽约早十三个小时.
They've only sold thirteen tickets so far.
到目前为止他们仅仅售出13张票。
Many people think thirteen is an evil number.
很多人认为十三是个不吉利的数字.