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A duck's quack doesn't echo, and no one knows why.
中文意思:
鸭子的叫声没有回声,此谜无人能解。


以下为相关句子列表(点击查看,可以看对应的解释):
A dual-coating technique uses both soy peptide and cellulose and gum to form protective layers, helping to deliver the probiotic straight to the intestines. 独特的双层包裹技术,以蛋白质包裹乳酸菌的表层,外层加上多醣,保护益菌直达肠道。
A dual-serial-port single-chip with dual serial port is used as the main control chip on front terminal to collect the signals of elevator status,fault and field equipments, meanwhile communicates with the single-chip MODEM on front terminal in serial mod 采用双串口单片机作为电梯远程监控系统前端机的主控芯片,对电梯运行状态信号、故障信号和现场接入设备状态信号进行采集,同时与集成在前端机上的单片式MODEM进行串行通讯,并通过公共电话网与服务器连接,实现电梯故障远程报警、运行状态信息记录和服务器主动呼叫查询等功能。
A ducal estate. 公爵领地
A duck will not always dabble in the same gutter. 一只鸭子不会常在同一条沟中玩水。
A duck's back sheds water. 鸭子的背部去水。
A duck's quack doesn't echo, and no one knows why. 鸭子的叫声没有回声,此谜无人能解。
A duel or battle with firearms. 枪战用火器进行的决斗或战斗
A dull explosive sound, usually short and repeated, made by or as if by a laboring engine. 嘎嚓声由或象是由工作的发动机发出单调的爆响声,通常短暂而重复
A dull, pedantic speaker or writer. 学究枯燥而迂腐的讲话人或作者
A dumb person can crack a nut a lot faster than a smart person if the dumb person has a nutcracker and the smart one only has a toothpick. 如果一个哑巴有坚果钳,而一个灵巧的人只有牙签,那么哑巴可以比灵巧人快得多地剥开坚果。
A dump truck full of dirt will go with the cement truck. 一辆装满废土的砂土车将会跟著混凝土预拌车.
 
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