Polish up your writing skills on a one-week professional course.上为期一周的专业课,提高你的写作技能。I'm going to New York, so I must polish up my English.我要去纽约, 因此我必须提高英语水平.You've got to polish up on your idiomatic expressions....
PVC laminating metal sheet and its composite sandwich panels have biggish market in ship at present.PVC复塑板及其复合夹芯板目前在船用上占有较大的市场.Low viscosity multipurpose resin used for casting or laminating room temperature.低粘度多用途树脂,用于室...