相空间

phase space (math., ordinary differential equations)

each other / one another / mutually / fret on the neck of a pipa 琵琶[pi2 pa5] (a fret on the soundboard is called a 品[pin3])

appearance / portrait / picture / government minister / (physics) phase / (literary) to appraise (esp. by scrutinizing physical features) / to read sb's fortune (by physiognomy, palmistry etc)

empty / air / sky / in vain

to empty / vacant / unoccupied / space / leisure / free time

space / room / (fig.) scope / leeway / (astronomy) outer space / (physics, math.) space

between / among / within a definite time or space / room / section of a room or lateral space between two pairs of pillars / classifier for rooms

gap / to separate / to thin out (seedlings) / to sow discontent