1.  busy
2.  on the line
3.  on the phone
4.  in the middle of a call

• 1. 在通话中: on the phone
• 2. 正在通话中的来电: Active Call
• 3. 在通话过程中启用: enabled during calls

• 1.他说，你和谁打电话呢，一直在通话中。
  And he said, who do you call it, has been on the phone.
  dict.yoduao.com
• 2.在普通话中，紫禁城被称为“紫禁城”。
  In Mandarin, The Forbidden City is called the Purple Forbidden City.
  dict.yoduao.com
• 3.我在全国大学英语考试、全国普通话水平测试和全国计算机二级考试中取得了良好成绩。
  I have got good results in the National College English Test, the National Mandarin Proficiency Test and the National Computer Rank Examination Level 2.
  dict.yoduao.com

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