preproduction model的用法和樣例：
例句
- It analyses the locomotion mechanism, and makes three model machines with different vibration angular.
分析了該機構的行走機理，製作了振動角不同的三台樣機。 - The results of dynamic simulation show that the virtual prototype model of the planet-cycloid reducer is valid and reliability.
模擬分析結果表明，提出的擺線針輪減速機虛擬樣機建模正確，有較好的可靠性和實用價值。
