短语 full of hot air 可以形容某人夸夸其谈、纸上谈兵。
My boss keeps promising to give me a pay rise but the extra money never comes. He is full of hot air!
My mate Phillip is full of hot air - he says he know lots of celebrities, but I know it's not true.
短语 to clear the air 的意思是消除误解、隔阂。
Mary and John had been arguing a lot. Mary decided they needed to clear the air and have an honest, open conversation.