sleek: suggests a smoothness or brightness resulting from attentive grooming or excellent physical condition: a ~ race horse.      （smooth平整applies to a flat or even surface especially free of irregularities表示平面没有不规则，如a smooth dance floor平整舞池）   （groom本意是to clean or brush an animal给马等动物梳洗，如to groom a horse/dog/cat刷洗马/狗/猫，引申为梳妆打扮，如you should always pay attention to personal grooming你应随时注意个人仪容. groom作名词表示马夫或新郎)   又如sleek black hair乌黑光滑的头发，如the sleek lines of the new car新车流畅的线条，如a sleek yacht造型流畅的游艇，如a sleek and ambitious politician衣冠楚楚、野心勃勃的政客


slick: suggests extreme smoothness that results in an unsafe or slippery surface: slipped and fell on the ~ floor.   这个词还常表示华而不实花言巧语


glossy: suggests a surface that is smooth and highly polished: photographs having a ~ finish.      （polish磨亮优雅修养to rub something with a cloth to make it shine，比喻优雅修养=refinement，如each morning he shaved and polished his shoes他每早刮脸擦鞋）      如glossy hair光亮的头发，a glossy brochure/magazine/photograph用亮光纸印刷的小册子/杂志/光亮的照片，来自gloss亮光漆、光泽涂料paint which, when dry, has a hard shiny surface，如two coats of gloss两层亮光漆


silken, silky: imply the smoothness and luster as well as the softness of silk: ~ hair(en); expensive dresses made of ~ fabrics(y).   光泽


satiny: applies to what is soft and smooth and shining: a flower's ~ petals.    丝织物中，"薄者为绸，厚者为缎"，silken,silky为丝绸，satiny为缎子


sleek光滑: 指平滑光亮，如因梳妆打扮，或身体健康，slick光滑: 表示光滑到不安全，glossy光滑: 也表示平滑光亮，silken, silky丝绸般的: 指光泽柔滑，satiny缎子般的: 同上


记忆方法: 1）首字母SSGSSS想成5Star Grade5星级<==光滑

         2）光滑的意思是外表平滑光亮mean having a smooth bright surface or appearance.