掩护射击

例句：

1. 1. The thief tried to mask his tracks with mud.
   小偷试图用泥巴掩盖他的脚印。
2. 2.The artist used a mask to disguise her identity.
   艺术家使用面具来掩饰她的身份。
3. 3.The spy hid the evidence in a book to mask its true nature.
   间谍将证据藏在一本书里，以掩饰其真实性质。