sleekness

1. Close the windows: it reduces the inherent aerodynamic sleekness of your car, and can lead to a 10% decrease in fuel economy.
   关上车窗：这能增强汽车的流线性，降低空气阻力，可以提高百分之十的燃料利用率。
2. Valerie Steele, director of the Museum at the Fashion Institute of Technology in New York, believes pregnancy has an image problem. It lacks the glamour and sleekness of the ideal female figure.
   纽约时装技术学院（theFashionInstituteofTechnology）博物馆馆长瓦莱丽•斯蒂尔（ValerieSteele）认为怀孕后会涉及形象问题，因为它没有了昔日女性完美身材的魅力及柔滑。
3. Urban sleekness and traditional quaintness highlight the contrasts of Hong Kong.
   城市的优美造型和传统的古雅情趣突出了香港的种种反差。

noun

1. the smooth feel of silk fabric

   Synonym:    silkiness

2. the quality of being well-groomed and neatly tailored
   1. the sleekness of his appearance reminded me of his financial successes