externality发音名词1外部性、外部效应、外溢效果经济学Air pollution from the factory is a classic negative externality.工厂排放的空气污染是典型的负面外部性。2外在性、外在、外部正式The painting's externality hides a much darker theme.这幅画的外在表象掩盖了更为阴暗的主题。用这个字练口说→