may and must

In the temporary tent, the old doctor was operating on a critical emergency patient. In the end, because a key part had to be sutured, the old doctor asked his assistant to help him take off his glasses, which was more convenient for the operation. Suddenly, the patient coughed, and blood sprayed on the old doctor's body, face, and even his eyes. After the assistant quickly wiped the blood, the old doctor went on to stop the bleeding and suture, and finally completed the operation.
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After the operation, the patient was sent to a large hospital for further treatment. Fortunately, all the indicators of the patient are normal and there is no infectious disease. The assistant breathed a sigh of relief: "Fortunately, otherwise it would be too dangerous. Doctor, you have overlooked one point, the patient will bleed at any time, and you will be infected." "I know, his illness is like this, and it may happen at any time Accident." The old doctor replied.
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The assistant was very surprised. Since this is the case, why did he dare to make such a move to expose himself to a dangerous situation? The old doctor looked at the assistant and said word by word: "If I take off my glasses, I may be in danger; but if I don't take off my glasses, or even give up treating him, then he will be in danger. An unknown danger and A definite danger, and given the limited conditions at the time, I had no choice."
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Human nature is good. On the premise of ensuring their safety, most people are willing to lend a helping hand to others; and when their safety is at risk, it is understandable to choose to be wise and protect themselves, but those who resolutely choose to help others show selflessness. The spirit of selflessness, selflessness, and fearlessness is always worth learning, singing about, and remembering.