safety net

• 1. 

  N-COUNT A safety net is something that you can rely on to help you if you get into a difficult situation. 安全保障

  例：

  Welfare is the only real safety net for low-income workers.

  福利是低收入工人们惟一真正的安全保障。

• 2. 

  N-COUNT In a circus, a safety net is a large net that is placed below performers on a high wire or trapeze in order to catch them and prevent them being injured if they fall off. (马戏团杂技表演使用的) 安全网