simulator for driver train-handling

例句：

1. 1. The engineer used a simulator to test the new design before it was built.
   工程师使用模拟器测试新设计，在建造之前。
2. 2. The simulator allowed us to simulate real-world scenarios without risking any real equipment.
   模拟器让我们能够在不冒任何真实设备风险的情况下模拟现实场景。
3. 3. The simulator proved to be an invaluable tool for training new employees.
   模拟器证明是培训新员工的宝贵工具。