CW / Morse Code Trainer莫尔斯电码练习器
莫尔斯电码（CW）是最具火腿特色的通联方式之一。本训练器采用 Koch 训练法：从两个字符起步，正确率达标后逐步增加字符，配合 Web Audio 生成的标准码音；也支持任意文本转莫尔斯播放，并附完整字符对照表。音频只在你点击播放后发声。
Morse code (CW) is one of the most iconic ham radio modes. This trainer uses the Koch method: start with two characters and add more as your accuracy improves, with standard Morse audio generated via Web Audio. It also converts any text to Morse and includes a full character reference. Audio starts only after you press play.
Learn Morse code with the Koch method, right in your browser. No sign-up, everything runs locally.用 Koch 方法在浏览器里学莫尔斯电码，无需注册，所有运算都在本地完成。
Audio Settings音频设置
Standard PARIS timing: dot = 1 unit, dash = 3 units.标准 PARIS 时规：点为 1 单位，划为 3 单位。
Koch TrainerKoch 渐进练习
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Koch method: master a small set first, then add one character per lesson.Koch 方法：先掌握少量字符，每课只增加一个新字符。