在轴测投影中凹回转曲面的外形线可能存在尖点，这就使凹回转曲面的外形线变得复杂。
Sometimes the outline of a concave revoluted curved surface in axonometric projection would be complicated when there are some singular points on the outline.
这个原型的轻型骨架是由金属杆与金属线组成的，由汽动装置控制，用它来作建筑物的墙壁，调整骨架布置就可以改变建筑物外形。
Lightweight skeletal frameworks, composed of rods and wires and controlled by pneumatic "muscles", serve as the walls of a building; adjusting their configuration changes the building's shape.
老饕或音响爱好者可能会认为K340更拉风一点，因为他有银黑色的外形与可调节音量的线控。
Experienced reviewers and audio aficionados will recognize that K340 is slightly more classy, with its stylish, black appearance and inline volume control.
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