smokescreen
/ˈsməʊkskriːn/noun
1- a cloud of smoke created to conceal military operations（隐蔽军事行动的）烟幕。
1.1
- figurative a ruse designed to disguise someone's real intentions or activities〈喻〉（掩饰真实目的、活动的）烟幕：
he tried to create a smokescreen by quibbling about the statistics.
他通过在统计数字上找茬来制造烟幕掩盖真相。