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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
に
direction, time, indirect object, or target markergrammar
揺れる
shake; sway; rock; tremble; waver; become unstable; be shakenichidan verb