自己进行by oneself

• 自行定夺

  make one's own decisions

• 自行处理

  settle by oneself

• 我国自行设计和建设的大桥

  bridge designed and built by China

参见：自动

• 自行脱党

  voluntarily leave the Party

• 敌人是不会自行消灭的。

  The enemy will not disappear by themselves.

• 反动派不会自行退出历史舞台。

  Reactionaries won't dismount the stage of history of their own accord.

【机】proper motion