May is the fifth month. 5月是一年的第5个月。
That was the third time he had entered the house. 那是他第3次进入这座房子。
In came the first runner, closely followed by the second. 第一位赛跑者进来了，紧跟着第二位也进来了。
但是，如果序数词前使用了物主代词或所有格之类的修饰语，则不能使用定冠词。如：
That would be his third wife. 那也许是他的第3个妻子了。
I got my first bicycle two years ago. 两年前我买了第一辆自行车。
另外，如果不是表示特定的第几，而是表示数量或序数的增加，则其前用不定冠词。如：
We’ll have to do it a second time. 我们得再做一次。
Shall I ask her a third time? 我还要问她一次吗?
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