【上位】 a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected" 単位時間と比較しての大きさまたは頻度。
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【下位】 a fast gait of a horse; a two-beat stride during which all four legs are off the ground simultaneously 馬の速い足並み。4本の脚すべてが同時に地面を離れるような、2拍子の走り方。
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