It's just an explanation.

A lip-service explanation [wind; Don't take one seriously; Keep one's word]

Non-material things; Empty talk; Talking about going northward and erasing the border is just talk, and will not March.

Word decomposition

Explain that what you say (say) is not to express your meaning in words: speak. Description. Speech. Explain. Introduce: Say (a. Introduce from it; B. consideration; C. speaking and speaking. "He" is pronounced softly). Matchmaker's opinion: theory. Write a book and make a statement. Strange: number theory. A style, such as Han Yu's interpretation of Shi Shuo; ; Used at the end of a declarative sentence to express a restrictive tone, equivalent to; That's all; , often with; Only; 、; However; 、; Only; One person, one table, one chair, one fan, one foot and one stroke. ; ; "Yu Chuxin zhi; The Preface to Autumn Poems explains the auxiliary words in detail. Only indicate