Correct

肃静

/ sùjìng / 
Strokes

Definition

silence/solemnly silent/peaceful/to pacify

Example

As an Adjective

solemnly still; silent; quiet

1
Qǐng
请
bǎochí
保持
sùjìng
肃静
  
!

Please keep quiet!

2
Sùjìng
肃静
wúshēng
无声

be solemnly still/silent