addn造句怎么写

尖叫的声音代表着城市的风格，融入了时代的因素，是一种文化，也是广告的原型。

Topical prepns. (cosmetics and pharmaceuticals) contain emulsifying agents (anionic, cationic and/or nonionic surfactants) and other ingredients with addn. of org. semiconductors (Ge, Ge compds. or salts) to promote peripheral vasodilation (skin metab.)