used in 簌簌[su4 su4]
very slight sound; rustling (onom.); to stream down (of tears); luxuriant growth (of vegetation)
shivering; trembling (idiom)
树叶在风中簌簌作响。
shù yè zài fēng Zhōng sù sù zuō xiǎng
The leaves on the trees rustle gently in the wind.