silencer

n (a) (Brit) (US muffler) device that reduces the noise made by a vehicle's exhaust （机动车的）消声器. =>illus at App 1 见附录1插图, page xii. (b) device that reduces the noise made by a gun being fired （枪的）消声器. silence interj be quiet 安静; 别出声: `Silence!' shouted the teacher. ｀安静!＇教师喊道.

signal, signal-box, signaller (US signaler), signally, signalman, signatory, signature, signature tune (also theme tune), signet, signet ring, significance, significant, significantly, signification, signify, signor, signpost, Sikh, silage, silence, silent, silent film, silently, silhouette, silica, silicate, silicon, silicon chip, silicone, silicosis, silk, silk-screen printing, silken, silkiness, silkworm, silky, sill, sillabub, silliness, silly,