Vectorcardiographic
心电向量描记法的
🗣️ 情景例句
Thank you. Would you like something to drink? A cup of coffee?
谢谢。你想喝点儿什么？来杯咖啡吗？
Light come,light go.
易得则易失；来得容易去得快。
The book is protected by copyright.
该书受版权保护。