n.快速；无常
And design that process is verified ultimately by the fact that the fleetness molding technology makes. 并且通过快速成型技术使设计过程得到最终验证。
Thinking of his declining family, he heaves a deep sigh over the fleetness of fate. 看到他们家衰败的样子，他不禁喟然长叹命运的无常。
