1、twelve是数字12的意思，可以做名词和形容词。比如The year is divided into twelve months。一年有12个月。
2、twelve作名词也有12点钟的意思。比如I shall stay here until twelve o'clock。我会留在这里直到12点钟。
3、I met some friends and stayed out until eleven or twelve。我见了几个朋友直到夜里十一二点钟才回家。
4、12的序数词是twelfth，比如I had to wait half an hour to jump，I was twelfth in line。我不得不等了半个小时才轮到我跳，因为我排在第12个。
