打字機上的一種控制鍵，當按下此鍵時(shí)便保持此狀態(tài)，直至釋放。
On a typewriter, a control that, when operated, is maintained in its position until released.
一種終端，它的鍵盤(pán)不包括全套的字母數字字符鍵；例如，只包括十個(gè)數字鍵以及若干控制鍵。
A terminal containing less than a full alphanumeric keyboard; for example, one containing ten numeric keys plus control keys.
字（詞）處理技術(shù)中使用的一種控制鍵，用于釋放或移動(dòng)記錄媒體到一個(gè)便于從設備上取走的位置。
In word processing, a control that releases or moves the recording medium to a position for easy removal from the equipment.
