自發zìfā spontaneous, voluntary, self-initiated to occur naturally, to arise spontaneously See also 自動. HSK 7
累積léijī to accumulate, to build up, to amass accumulation, buildup As in the “passive accumulation over time”. See also 聚集, 收集. HSK 7TOCFL 7
共鳴gòngmíng resonance, sympathetic vibration to resonate, to strike a chord, to feel empathy or connection with something HSK 7TOCFL 7