substitutes n.代用品；代替者；替补队员vt.代替；用 ... 代替；代以substitute (v.) substitute n.代用品；代替者；替补队员vt.代替；用 ... 代替；代以substation (n.) substantive (adj.) substantiation (n.) substantiate (v.) substantial (adj.) substandard (adj.) substance (n.) substance n.实质；物质；财产；内容；重要性subspecies (n.) subsonic (adj.) subsoil (n.) subsistent (adj.) subsistence (n.) subsist (v.) subsidy (n.) subsidize (v.) subsidise (v.)