请将以下段落改写为更加专业的表达:  
献血前，需要知道一些要点。比如，你前一天不能喝含有酒精的饮料。前一天吃的食物要清淡一些。前一天晚上，至少要睡6个小时。还要在献血前四周没有用过注射器。这些都是为了保护自己与受血者的健康。另外，在献血的时候最好有一位朋友或家人陪同。如果献血后感到晕眩或不舒服，身边有人能够及时帮助。  

 Donateors should be aware of several key points prior to donating blood. For instance, it is essential to abstain from consuming alcoholic beverages the day before the donation. The diet should consist of light meals on the day before the donation. Getting at least six hours of sleep the night before the donation is crucial. Additionally, donors should not have used injection devices within the past four weeks. These precautions are necessary to safeguard the health of both the donor and the recipient. Moreover, it is advisable to have a friend or family member accompany the donor during the blood donation process. In the event of feeling faint or unwell after the donation, having someone present can provide timely assistance.
user
献血者在献血前需注意以下关键事项。例如，献血前一天应避免饮用含酒精的饮料。前一天的饮食应以清淡为主。前一晚需要保证至少六小时的睡眠。此外，献血者应在过去四周内未使用过注射器。这些预防措施旨在保障献血者和受血者的健康。另外，建议在献血过程中有一位朋友或家人陪同。如果献血后感到头晕或身体不适，有同伴在场可以及时提供帮助。
assistant