12岁的英文twelve years old.教授4到12岁儿童 professor 4 to 12 years old children今天是我12岁生日 today is my 12th birthday大家可以看看，he is junior to me by two years.他比我小两岁。一个12岁的男孩 a 12 year old boy12岁的英文，那是我们不过12岁 we were 12 years old...
