Simple cardiopulmonary resuscitation model, as an important tool in first aid skills training, is not only the medium of technology transmission, but also the faithful witness of each learner's journey of first aid skills transformation. In this journey, it has witnessed the leap and growth of each learner from theory to practice from the initial strange company to the final familiar mastery.

At first, for most learners, cardiopulmonary resuscitation was a mere concept that remained in the pages of a book, and the complex steps and precise requirements seemed daunting. However, when the simple CPR model appeared, it all began to become concrete and vivid. With its intuitive design and easy operation, the model allows learners to touch and experience every detail of cardiopulmonary resuscitation. From the intensity and rhythm of chest compressions to the frequency and depth of artificial respiration, each exercise leaves its mark on the model and plants the seeds of skill in the learner's mind.

As the practice progresses, learners begin to master the basic skills of CPR. They learned how to adjust the intensity and frequency of compressions based on the patient's response, and how to keep the airway open for effective ventilation. The mastery of these skills does not happen overnight, but requires constant repetition, reflection and improvement. In this process, the simple version of the cardiopulmonary resuscitation model is always accompanied by the side, silently recording every progress and every challenge of the learners.

Ultimately, when learners are able to perform CPR with proficiency and confidence, their first aid skills have achieved a metamorphosis from theory to practice. All these achievements are inseparable from the companionship and witness of the simple version of cardiopulmonary resuscitation model. It is not only a training tool, but also a growth partner, witnessing the whole process of learners from unfamiliar to familiar, from awkward to proficient.

Therefore, we can say that the simple CPR model is a faithful witness to the metamorphosis of first aid skills. In its unique way, it accompanies each learner through this journey full of challenges and gains, so that they can be more leisurely and comfortable in the future first aid scene.