The system consists of an upper-computer display, a lower-computer execution control as well as an upper-lower computer communication.
该系统由上位机显示控制、下位机执行控制、上下位机通信三部分组成。
When you work at a computer, the keyboard should be at elbow height, so your upper and lower arms form an Angle of 90 degrees or more and your forearms are supported by armrests.
当你在电脑前工作时，键盘应该和肘部齐高，这样你的大臂与小臂成90度角或更大的角度，小臂可以放在椅子扶手上。
The upper order computer system manages lower order computers and processes synthetic information.
上位机系统实现对下位机的管理及对综合信息进行加工、处理。
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