1.  keying
2.  key modulation
3.  handling

• 1. 键控: keying | Keyed | KX key | Key control
• 2. 关键控制点: Critical Control Point | key control point | HACCP
• 3. 频移键控: FSK | frequency shift keying | FSK Transceive | HST-FSK

更多释义

• 1.为键控物理或逻辑文件创建索引。
  An index is created for a keyed physical or logical file.
  dict.yoduao.com
• 2.图4对这些关键控件的位置进行了批注。
  Figure 4 is annotated with the locations of these key controls.
  dict.yoduao.com
• 3.第4种情况：使用魔术键控顺序进行回溯跟踪。
  Scenario 4: Getting back trace using magic key sequence.
  dict.yoduao.com

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