一旦这种情况发生了，歌剧表演的主题也会开始改变。
Once that happened, the themes of the opera presentations also started to change.
一旦这种情况发生，整个国家将面临长期的经济增长放缓。
As that happens, the country could face a prolonged period of slower growth.
Gali博士说一旦这种情况发生，人们就会出现治疗创伤后紧张的症状。
Doctor Gali says when that happens, people experience symptoms of post-traumatic stress disorder.
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