When installing electrical equipment don't take any chances. A mistake could kill.
安装电器设备时千万不要冒险，弄错了有可能会出人命的。
He had been on site many weeks installing and testing his equipment.
他已经在工地上呆了好几个星期来调试他的设备。
Installing such equipment was not viable for many smaller companies.
安装这种设备是不可行的，许多小公司。
They have been installing the equipment this week.
这个星期他们一直在安装设备。
They have been installing the equipment this week.
这个星期他们一直在安装设备。
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