“逐渐消失的”常见英文表达有 “gradually disappearing” 、“fading away gradually” 或 “vanishing gradually” ，具体使用可根据语境和表达习惯来选择：
gradually disappearing：强调以一种缓慢、渐进的方式不再存在或难以被察觉到。例如：The old traditions are gradually disappearing in the modern society.（在现代社会，旧传统正逐渐消失。）
fading away gradually：侧重于形象地描述事物像慢慢褪色一样，逐渐从视野或意识中淡去。例如：The sound of the distant bell was fading away gradually.（远处钟声正逐渐消失。 ）
vanishing gradually：“vanish”本身有“突然消失；不复存在”的意思，加上“gradually”后，更强调这种消失的过程是逐渐的。例如：The stars are vanishing gradually as dawn approaches.（随着黎明临近，星星正逐渐消失。 ）