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- Smarandache double factorial function Smaradache双阶乘函数
- double factorial function 双倍因子函数
- Thus, for example, if f was the factorial function, recursively defined for only n iterations, then g could be the factorial function, recursively defined for n+1 (or more) iterations. 偏函数的偏序有一个底元素，完全未定义函数。它还有链的最小上界。各种额外性质经常是合理的和有用的: 在域理论条目中有更详尽细节。
- double factorial partial sequence 双阶乘部分数列
- The class is abstract with a static factory function that returns an instance of a concrete derived class. 阶级是抽象的同一个静态工厂函数返回的是一个具体的派生类.
- 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。
- A couch performs a double service. 躺椅有双重的服务。
- 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。
