“经久的”的英语可以翻译为：durable，prolonged ...

她携带含泪的微笑读那封盼愿已经久的信.She read the long - awaited letter with a tearful smile.其他姿态都可以是变动不定,了无痕迹的, 风格却是性格的最终极最经久的表露.Other gestures shift and change and flit, this is the ultimate and enduring revelation of personality....