/kuài yào dōngtiān le/

/kuài yào dōngtiān le/

快 /kuài/ means FAST

When we combine 快 /kuài/ with 要 /yào/ (which indicates a future tense), we say that something is about to happen in a short time.

了 /le/ indicates a CHANGE OF STATE

lit. translation could be also: WINTER IS COMING SOON