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- The double step drum 双阶梯卷筒
- Note: The double step reducing ratio consists of the both mono-step reducing ratio.The unlisted on the above table also can be produced. 注:双级减速比由两单级速比组合而成,上表中未列出的亦可生产。
- This taking en-passant must be done directly: if the player who could take en-passant does not do this in the first move after the double step, this pawn cannot be taken anymore by an en-passant move. 这种走顺道必须直接做：如果能够走顺道的那一方在对方的两步后第一次移动时没有进行顺道，那么这个兵就不能在顺道时被吃掉了。
- The soldiers came at the double. 士兵们是急行军来的。
- John is the double of his father. 约翰长得酷似他父亲。
- Fire engines came on the double when the house was on fire. 房子着火后，救火车很快就来了。
- She's going for the double this year, the Olympics and the World Championship. 今年她要争取奥林匹克赛和世界杯冠军赛的双料冠军。
- Send a doctor here, on the double! 派个医生来，要快！
- She is the double of her mother. 她和她妈妈长得一模一样。
- Make sure you type the double quotes. 确保键入了双引号。
- I have the new teacher the double - O. 我仔细打量了这位新来的老师。
- Now then, at the double! We have no time to waste. 喂，快点！我们没时间了。
- He wants to see you in his office on the double. 他要你赶快到他办公室去。
- A/B: We all like the Double Tenth Day! 种种的理由,我们就是喜欢双十节!
- The boss wants you you'd better get upstairs at the double. 老板叫你－－你最好赶紧上楼去，
- Each step of the double helix is a base made up of two kinds of nucleic acid. 每阶二重螺旋线都是一个碱基，由两种核酸组成。
- He was teamed with his brother in the doubles. 他被安排和哥哥搭档参加双打。
- The beats of the drum were steady and slow. 鼓声平稳而缓慢。
- Her clothes spread out on the double bed. 她的衣服散乱地铺满了双人床。
- Now then,at the double! We have no time to waste. 喂，快点！我们没时间了。
