Correct

三等

/ sān děng / 
Strokes

Definition

third class

Example

As an Adjective

third-class; third-rate

1
Chéng
乘
sānděngchē
三等车
lǚxíng
旅行

travel third-class

2
Sānděng
三等
lǚguǎn
旅馆

third-rate hotel

3
Sānděng
三等
kèchē
客车

third-class coach