第 + number + classifier + noun forms ordinals (first, second, third).
Ordinal marker - 第 converts cardinal numbers into order.
Common contexts - pages, floors, rankings, chapters.
Fixed order - 第 + number + (classifier) + noun.
See examples below for varied real-world usage.
Do not omit 第
- ✅ 第三名
- ❌ 三名
Keep order fixed
- 第 + number + classifier + noun
Separate quantity vs order
- 三本書 = three books
- 第三本書 = the third book
I live on the tenth floor.
Please turn to page twenty five.
He got first place in the competition.
This is the third time we meet.
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