空对空

空对空

Literally means:

emptiness to emptiness

Actually means:

all speak empty words in a discussion

It refers to empty words to empty words. It means in a discussion, every one speaks empty words, or what they speak of is irrelevant to the practical reality. It also means one essay or speech is full of words bearing no practical significance. Derogatory.

空话对空话。指在对话或讨论中，各个人所说的话都是内容空洞，或不联系实际，不符合实际的空话。也指文章或讲话都是毫无意义的空话。具有贬义色彩。