STFT短时傅里叶变换STabbr.标准时间（=standard time）；街道（=street）stipulatio poenae[法] 罚金契约St. Regis Hotel稳流装置storing mechanism存储机构Stoughton bitters[医] 复方苦艾酊storing stability贮存稳定性stucture analysis结构分析stimulation force激振力Stomorhina lunatan.月纹口鼻蝇Sturnus pagodarumn.黑冠椋鸟stimuli subsystem激励源子系统

1. Instantly, the clouds' fringe turned as smooth as a stithy from the sunflower's overlapping shape, while the clouds became gloomy as they should be.
   顷刻间，葵花状的云边变得像铁砧一样平展，云层也露出了阴暗的本色。