In the past, one day I can hold some 10 boxes, now installed only a few per day, or even none.
以前我一天能装10来个箱子，现在每天只能装几个，甚至一个也没有。
The problem caused by some factors such as parameters of devices and PCB, layout of devices on PCB and trace of high-speed signal, etc results in the unstable or even none operation of system.
元器件和PCB板的参数、元器件在PCB板上的布局、高速信号的布线等因素，都会引起信号完整性问题，导致系统工作不稳定，甚至完全不工作。
The problem caused by some factors such as parameters of devices and PCB, layout of devices on PCB and trace of high-speed signal, etc results in the unstable or even none operation of system.
元器件和PCB板的参数、元器件在PCB板上的布局、高速信号的布线等因素，都会引起信号完整性问题，导致系统工作不稳定，甚至完全不工作。
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