lower dead-center indicator

例句：

1. 1. The engineer useda lower dead-center indicator to measure the accuracy of his calculations.
   工程师使用下死心中心指示器来测量他的计算的准确性。
2. 2. During the manufacturing process, the lower dead-center indicator is crucial for ensuring the quality of the finished product.
   在制造过程中，下死心中心指示器对于确保成品的质量至关重要。
3. 3.The lower dead-center indicator was designed to help operators quickly identify any issues with the machine's performance.
   下死心中心指示器被设计用来帮助操作员快速识别机器性能的任何问题。