This invention relates to a defrosting device of optical communication system, including a glass substrate with a heating device on it and the glass substrate is float valve substrate.是什么意思_This invention relates to a defrosting device of optical communication system, including a glass substrate with a heating device on it and the glass substrate is float valve substrate.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句