为什么在打针前要擦酒精棉？

在我们接受医疗护理时，经常会见到医生或护士在给我们做注射前使用酒精棉擦拭注射部位。这一步骤看似简单，却有着重要的作用。

首先，擦拭注射部位可以有效地清洁皮肤表面。酒精是一种有效的消毒剂，能够杀灭细菌和其他病原体。通过擦拭注射部位，酒精可以去除皮肤表面的污垢和细菌，减少引起感染的风险。

Why is it necessary to wipe with alcohol cotton before getting an injection?

When we receive medical care, it is common to see doctors or nurses wiping the injection site with alcohol cotton before giving us injections. This seemingly simple step plays a crucial role.

Firstly, wiping the injection site can effectively clean the surface of the skin. Alcohol is an effective disinfectant that can kill bacteria and other pathogens. By wiping the injection site, alcohol can remove dirt and bacteria from the skin surface, reducing the risk of infection.

此外，擦拭注射部位还可以帮助打开毛孔。酒精具有刺激性，可以促进皮肤的血液循环并扩张毛孔。这对于注射药物的渗透性很重要，因为药物可以更容易地通过扩张的毛孔渗入皮肤组织。

Furthermore, wiping the injection site can help to open the pores. Alcohol is an irritant that can promote blood circulation and expand pores on the skin. This is important for the permeability of the injected medication, as the medication can more easily penetrate the skin tissues through the expanded pores.

另外一个原因是擦拭注射部位可以减轻注射时的疼痛感。酒精可以冷却皮肤并麻木神经末梢，从而减少注射过程中的不适感。这对于那些对注射非常敏感或害怕疼痛的人来说尤其重要。

Another reason is that wiping the injection site can alleviate the pain during the injection. Alcohol can cool the skin and numb the nerve endings, reducing the discomfort during the injection process. This is particularly important for those who are very sensitive to injections or afraid of pain.

最后，擦拭注射部位还有助于提高注射的成功率。通过清洁和刺激注射部位，酒精棉可以帮助医生或护士更准确地定位血管或注射点，从而确保注射的准确性和安全性。

Lastly, wiping the injection site also helps to improve the success rate of the injection. By cleaning and stimulating the injection site, alcohol cotton can assist doctors or nurses in more accurately locating blood vessels or injection points, ensuring the accuracy and safety of the injection.

总之，在接受注射前擦拭注射部位是一个重要的步骤。它可以清洁皮肤表面，帮助药物渗透，减轻疼痛感，并提高注射的成功率。因此，我们应该理解并配合医务人员进行这一步骤，以确保我们的医疗护理质量和安全。

In conclusion, wiping the injection site before receiving an injection is an important step. It can clean the surface of the skin, facilitate drug penetration, alleviate pain, and improve the success rate of the injection. Therefore, we should understand and cooperate with healthcare professionals in this step to ensure the quality and safety of our medical care.