Correct

双层

/ shuāngcéng / 
Strokes

Definition

double tier/double decker

Example

As an Adjective

double-decker

1
Shuāngcéng
双层
qiáo
桥

double-decker bridge

2
Shuāngcéng
双层
jiāohébǎn
胶合板

two-ply board

3
Shuāngcéng
双层
chēkù
车库

double-deck garage

4
Shuāngcéng
双层
bōlichuāng
玻璃窗

double window; double-glazed window