1.My major is Biomedical Engineering which research and develop medical equipment.2.My major is Biomedical Engineering which focuses on medical equipment research and development.注：1.“reaserch and development medcial devices”这句话有语法错误（development）和单词拼写错误（reaserch和medcial），应该为“research and develop medical devices"。2.“医疗器械”翻译为“medical equipment”。参考资料：中国国际医疗器械博览会（CMEF）China International Medical Equipment Fair3.第一句是按照你提供的顺序翻译的，可以使用。第二句才是更地道的英语。
水里漂浮的雨
