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- The figure defined by the illusory watercolor appears dense and slightly elevated.When the colors of the double contour are reversed, the same region appears a cold white and slightly recessed. 由这种错觉水彩画出的图形，看来较为致密且稍稍凸起，将这双层轮廓的颜色互换之后，则同样的区域看起来会较冷白且稍稍凹陷下去。
- Inasmuch as the contoured walls are usually overcorrected for their own boundary layer, the flow in the planes parallel to the flat walls diverges. 只要曲壁附面层的修正通常是超过需要量的，平行于平壁的平面上流动就发散。
- He is working double tides to finish his essay. 他日夜苦干，赶写他的文章。
- I do not realize it is a double feature. 我原先不知道这是双片连映。
- Double agents live in a perpetual state of fear. 两面派永远过着提心吊胆的生活。
- I want a double room with a view. 我要一间能看到风景的双人房间。
- He was so fat that he had a double chin. 他胖得有双下巴了。
- The carpet is too thick to double up. 这地毯太厚没法折叠。
- Is the material single width or double width? 这幅料子是单幅的还是双幅的？
- Reserve double room June fourth to tenth inclusive. 预订双人房间，六月四日至十日，共六晚，望订妥复电。
- In this case, I can double for penalty. 假如这样的话，我可以叫加倍了。
- Can you tell me the rate for a double room, please? 请告诉我一间双人房的费用可以吗？
- The soldiers came at the double. 士兵们是急行军来的。
- Water-proof double wall lining canopy. 防水及防雨式双层钢板保护外罩。
- A couch performs a double service. 躺椅有双重的服务。
- This is a large on-going double wall pipe project. 这是一个很大的正在进行的双重管线项目。
- Look, double yellow lines you mustn't park here. 喂，这是双黄线--不能在这儿停车。
- Please double up the chair and put it aside. 请把椅子折起来放在一边。
- For strong sewing use double, not single thread. 为了缝得牢，用双线，而不要用单线。
- Do you want a single room or a double room? 您要单人房还是双人房？
