约莫一两小时后，一尾三角鱼鳍划过水面，围着一群人转起了圈。
After an hour or two, a triangular fin sliced the surface of the water and circled the group.
611所(成都飞机设计院)早在1960年代末就开始研究鸭式无尾三角翼布局飞行平台。
611 institute (Chengdu Aircraft Design institute) initiated studied on the "tailless delta-canard" wing planform as early as the late 1960s.
采用三转角轧制法轧制厚壁管和相反的操作法轧制薄壁管可消除喇叭口与尾三角。
The end trumpet and end triangle can be eliminated if a rolling process with three angles rotating is used for thick wall pipe rolling and other processes for thin wall pipe rolling.
建立了正三角形钝体尾迹流流动模型，基于冷态实验对粗糙壁面钝体尾迹流进行了求解，并与光滑壁面钝体的解进行了比较。
Mathematical analysis and numerical simulation is performed for the flow field near a rough wall based on an improved theoretical model proposed for the problem.
建立了正三角形钝体尾迹流流动模型，基于冷态实验对粗糙壁面钝体尾迹流进行了求解，并与光滑壁面钝体的解进行了比较。
Mathematical analysis and numerical simulation is performed for the flow field near a rough wall based on an improved theoretical model proposed for the problem.
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