Baike glosses jade mat as a bamboo mat as smooth as jade. The vernacular tl editorializes here by adding that the jade mat reveals the coolness of autumn.

Magnolia boat is even in the dictionary as just 'poetic name for a boat'. Baike adds some context for this history and says some say that it is indicating a bed.

Baike glosses brocade letter as a poetic way to say letter and gives the origin story for this term.