不是啊！
以second为例的片语和句子：
a second year student
Clinton's second term in office （美国前总统克林顿第二任期）
She won second prize.
We advertised for a second guitarist.
I asked the doctor for a second opinion
fourth, sixth... 同样也有前面不用the的情况：
例句：
Today is her fourth birthday （今天是小女四岁生日）
Mark is starting fourth grade in the fall. （Mark今年秋天就要上四年级了）