1. Ichthyosaurs were reptilian contemporaries of the dinosaurs, with fins and streamlined bodies. 鱼龙是与恐龙同时代的爬行动物，它有鳍和流线型的身体。
2. Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land dwelling mammals. 它们的身体呈流线型，后肢完全消失，身体上长出了尾片和喷水孔，所有这些特征都无法掩饰它们与陆生哺乳动物之间的亲缘关系。
3. The cars all have a new streamlined design. 这些汽车都是流线型新款。
4. The production process is to be streamlined. 生产流程还需改进。
