Correct

打底子

/ dǎdǐ zǐ /
Strokes

Example

As a Verb

make a draft/sketch; sketch

1
Xiě
wénzhāng
文章
zhīqián
之前
xiān
zi
底子
  

Make a draft before you write an article.

As a Verb

put sth at the bottom

2
miàn
地面
yòng
sān
打底子

put a layer of lime, sand and clay at the bottom of the floor

As a Verb

lay a foundation

3
Zhè
mén
可以
bāngzhù
帮助
xuésheng
学生
hǎo
zhèzhǒng
这种
yán
语言
de
zi
底子
  

This course enables the students to get a basic grounding of this language.

4
lùn
不论
xué
shénme
什么
dōu
yào
xiān
hǎo
zi
底子
  

Whatever you learn, you must lay a good foundation first.

Related

打底子