第

第

Prefix for ordinal numbers (e.g., first, second, third).

In this sentence, the word '第' is used to denote ordinal number.

这是我第一次参观这座博物馆。

This is my first time visiting this museum.

Here, '第' is used to indicate ranking or level, combined with '一名' (first).

他是我们班上的第一名。

He is the first in our class.

In this case, '第' is used to express a sequence or stage, specified as the second stage.

比赛的第二阶段将于下周开始。

The second stage of the competition will start next week.