Clear sky. Tang Du Mu's poem "Looking at Autumn in Chang 'an": "Outside the frost tree, there is not a spark in the mirror." Song Chenliang's poem "A Conghua Xitang Plays with the Moon" reads: "The ice wheel slants the mirror for a long time, and the river practices the cold light."
word decomposition
interpretation mirror (mirror) √ an instrument used to reflect images: mirror (also referred to as "glasses"). Mirror stage. Dressing case. Mirror. Bronze mirror. Dressing mirror For all kinds of instruments manufactured by optical principles, the lenses on them are generally made of glass: lenses. Lens. Glasses. Gastroscope. Convex mirror Concave mirror Triprism. Telescope. The explanation of the sky is high above the ground: the sky. Sky. Plough (Big Dipper). Tianyuan (heaven and abyss, metaphorically different). Be unconstrained and unconstrained. On top: the top of the sky (the blank above the page). Climate: weather. It is cold. Season, season: winter.