外层空间

outer space

outside / in addition / foreign / external

outer layer / outer shell

to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers

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