Maintenance texts are text messages sent to those people you'd like to date "someday" or "eventually" to remind them that you exist and to stay in touch with them without really meeting them. It's a low effort way to maintain a connection without having to really commit to anything serious.

“维护短信”是你给那些可能“改天”或者“找时间”见面的人（其实就是备胎啦）发的短信，这样既能让他们知道你这个人还在、与他们保持联络，也不用真的去跟他们见面。这是一种保持联系，又不用做出任何承诺的低成本维护方式。