当计算机的某个部分必须被直接控制时，如监视器上的单个点或者流向打印机的单个字符，这时也使用汇编语言。
Assembly languages are also used when some part of the computer has to be controlled directly, such as individual dots on a monitor or the flow of individual characters to a printer.
直接操作是隐式操作的一种，它会让用户觉得可以直接控制计算机显示的对象。
Direct manipulation is an example of an implied action that allows users to feel that they are controlling the objects represented by the computer.
铁路车站计算机联锁控制系统，直接关系到列车运行的安全。
The interlocking control system of railway computer is directly related to the safety of train moving.
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