HSK 2
Correct

第一

/ dì yī / 
Strokes

Definition

first/number one/primary

Example

As a Numeral

first

1
Yībǎi
一百
mǐ
米
pǎo
跑
dìyī
第一

come in/finish first in the 100-metre dash

2
Fǎyǔ
法语
kǎo
考
le
了
dìyī
第一

come out first in the French examination; get a first in French

As an Adjective

primary; foremost; first and foremost

3
Bǎiniándàjì
百年大计
  
,
zhìliàng
质量
dìyī
第一
  
。

Quality should be given first/top priority as it is a matter of primary importance for generations to come.