塞擦声

例句：

1. 1. The sound of the bell was a soft _s_ sound.
   铃铛的声音是柔和的_s_声。
2. 2. The teacher explained the concept using a _s_ sound.
   老师用一个_s_声来解释这个概念。
3. 3. The word "_s_" is pronounced as /s/ in this context.
   在这个语境中，“_s_”这个词发音为/s/。