schwa

n (phonetics 语音) 1 sound occurring in unstressed syllables and diphthongs in English, eg the `a' in `about' 非重读央元音, 混元音（英语里出现在非重读音节和复合元音中的中性元音, 如 about 中的 a）. 2 phonetic symbol for this, / E; E/ 国际音标中的 / E/.

scholastic, scholasticism, school, school age, school attendance, school-age, school-days, school-leaver, school-marm, schoolboy, schoolfellow (also `schoolmate), schoolgirl, schoolhouse, schooling, schoolman, schoolmaster, schoolmate, schoolteacher, schoolwork, schooner, sci-fi, sciatic, sciatica, science, science fiction, scientific, scientifically, scientist, scimitar, scintilla, scintillate, scintillating, scintillation, scion, scission, scissor, scissors, sclerosis, SCM, scoff,