air defence work

例句：

1. 1. The government has launched a new air defence system to protect against potential terrorist attacks.
   政府已经启动了一个新的防空系统，以保护免受潜在的恐怖袭击。
2. 2. The air defence work is crucial for the survival of our country's economy.
   防空工作对于我国经济的存续至关重要。
3. 3. During the war, the air defence work was a major factor in determining the outcome of battles.
   在战争中，防空工作是决定战斗结果的重要因素。