简体转繁体、台湾正体、香港繁体，也能整份转回简体。只换台词正文 —— 时间轴、序号、ASS 的样式指令一个字都不动。词库来自 OpenCC，一简对多繁（干净、头发）不会转错。
Convert a whole subtitle file between Simplified and Traditional, changing nothing but the dialogue.
Nine directions: general Traditional, Taiwan vocabulary, Taiwan forms, Hong Kong, back to Simplified, and Traditional-to-Traditional regional forms. Uses the OpenCC dictionary with longest-match-first phrase resolution.
Anyone delivering subtitles to Taiwanese or Hong Kong audiences, distributors preparing regional versions, and editors who received a Traditional file and want Simplified.