一増一減 いちぞういちげん 16,800,000-year period over which a human lifespan increases from ten years to 84,000 years (by one year per century) and then decreases back to ten (by one year per century) n Buddh Advanced ➥
人口減少 じんこうげんしょう depopulation; falling population; decrease in population; population decline n Advanced ➥