模拟信号

例句：

1. 1. The engineerused a simulator to test thenew circuit design.
   工程师使用模拟器测试新的电路设计。
2. 2. The simulator was used tosimulate the behavior of the system under differentconditions.
   模拟器被用来模拟系统在不同条件下的行为。
3. 3.The simulator allowed us to quicklytest and refine our software without the needfor expensive hardware.
   模拟器让我们能够快速测试和改进我们的软件，而无需昂贵的硬件。