calm and unperturbed in spirit; emotionally serene and unaffected by external disturbances or desires; impervious to desires and passions.
尽管周围环境喧嚣吵闹，他依然古井无波，专心致志地阅读手中的书籍。
Despite the noisy and bustling surroundings, he remained calm and unperturbed, focusing intently on the book in his hands.
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