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Span Details
交互に
alternately; by turns; one after the otheradverb
上下
top and bottom; upper and lower; up and down; rising and falling; fluctuating; going up and down; going and coming back; round trip; upper and lower classes; ruler and ruled; government and people; first and second volumes; two-piece outfitnoun, suru verb
する
light/support verb with a noun or noun-like phrasegrammar