by oneself

• 单独行动

  act alone

• 单独谈判

  independent negotiation

• 单独媾和

  make a separate peace

• 单独仲裁

  independent arbitrator

• 单独监禁

  solitary confinement

• 单独飞行

  solo flight

• 单独生活

  live alone

• 单独会见

  individual meeting

• 单独投资

  sole investment

• 单独设计

  individually designed

• 单独部件

  individual component

• 单独谈谈

  have individual discussions

• 对每个人单独说明

  explain to everybody one by one

• 单独一人对付不了。

  I can't deal with it by myself.