talk big; spout hot air; indulge in idle boasting 短语和例子 净放空炮 have an empty talk; 不要放空炮, 拿出行动来。 now, none of your empty talk. let's see how you act. 我当时放了空炮, 对形势作出了过于乐观的分析。 i then made some groundless remarks, assessing the situation over-optimistically