映衬着灰色水泥墙背景，与视线平行，如同当代艺术展上展品般引人注目。
It is mounted at eye level on a grey concrete wall, an arresting display that could almost be an installation in a contemporary art show.
建立平行、不可展直纹面数学模型，确定超声磨削加工平行、不可展直纹面时磨轮空间轨迹及其算法。
The mathematical model of parallel and undevelopable ruled surface was constructed, the algorithm for NC ultrasonic grinding surface was founded.
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