Using traditional plumb lines in elevator guide rails' installation is difficult to ensure the installation accuracy, wasting time and Labour.
电梯导轨安装精度以往多采用吊线锤法，一般很难保证导轨的安装精度，且费时、费力。
The elevator works like this: the car which carries passengers travels up and down the lift shaft between guide rails.
电梯的工作原理是这样的：载有乘客的电梯厢在升降井里沿着两旁的导轨上下运行。
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