尊敬的蔡教授，各位同学们，大家晚上好！
Dear Professor Cai, dear students, good evening!
今天我想和大家聊聊一个备受关注的话题——能够预防癌症的食物成分。
Today I would like to talk to you about a topic that has attracted a lot of attention - food ingredients that can prevent cancer.
我们都知道，癌症是一种令人畏惧的疾病，它不仅威胁着人们的健康，还常常给家庭和社会带来沉重的疾病负担。2022年全球癌症统计数据显示，全球有近2000万癌症新发病例和近1000万癌症死亡病例，主要归因于肺癌、乳腺癌、结直肠癌。癌症的高发生率与高死亡率使得癌症预防和治疗备受人们关注。
We all know that cancer is a dreaded disease that not only threatens people's health, but also often places a heavy burden on families and society. Global cancer statistics in 2022 show that there are nearly 20 million new cases of cancer and nearly 10 million cancer deaths worldwide, mainly due to lung, breast, and colorectal cancers. The high incidence and mortality of cancer have made cancer prevention and treatment a concern.
“一天一苹果，疾病远离我”，这是一句令人熟悉的西方习语；此外，在我们日常生活中，经常能在互联网中刷到“癌细胞最怕的这几种食物”“十大抑癌食物”等推文、视频，可以看出食物预防癌症在人们心中留下了深刻的印象。接下来，我将从哪些食物成分可以预防癌症以及其预防机制，就我搜索到的研究论文进行分享。
"An apple a day, sickness stays away from me", this is a familiar Western idiom; In addition, in our daily life, we can often swipe tweets and videos such as "these foods that cancer cells are most afraid of" and "top ten cancer-inhibiting foods" on the Internet. It can be seen that food prevents cancer and leaves a deep impression on people's minds. Next, I will share the research papers I searched for from which food ingredients can prevent cancer and how they prevent it.
首先，（Natural Polyphenols for Prevention and Treatment of Cancer ：There is much epidemiological evidence that a diet rich in fruits and vegetables could lower the risk of certain cancers. The effect has been attributed, in part, to natural polyphenols. Besides,numerous studies have demonstrated that natural polyphenols could be used for the prevention and treatment of cancer. Potential mechanisms included antioxidant, anti-inflammation as well as the modulation of multiple molecular events involved in carcinogenesis.）预防和治疗癌症的天然多酚这篇论文中提到：富含水果和蔬菜的饮食可以降低患某些癌症的风险。这种效果部分归因于天然多酚。此外，大量研究表明，天然多酚可用于预防和治疗癌症。可能的机制包括抗氧化、抗炎以及调节参与致癌作用的多种分子事件。
First, (Natural Polyphenols for Prevention and Treatmentof Cancer:There is much epidemiological evidence that a diet rich in fruits and vegetables could lowerthe risk of certain cancers. The effect has been attributed, in part, to natural polyphenols. Besides,numerous studies have demonstrated that natural polyphenols could be used for the prevention andtreatment of cancer. Potential mechanisms included antioxidant, anti-inflammation as well as themodulation of multiple molecular events involved in carcinogenesis.Natural polyphenols for the prevention and treatment of cancer, as mentioned in the paper, a diet rich in fruits and vegetables can reduce the risk of certain cancers. This effect is partly due to natural polyphenols. In addition, numerous studies have shown that natural polyphenols can be used to prevent and treat cancer. Possible mechanisms include antioxidant, anti-inflammatory, and modulation of multiple molecular events involved in carcinogenesis.
接下来，让我们谈谈膳食纤维。膳食纤维能够促进肠道蠕动，帮助排出体内的有害物质，减少致癌物质的滞留时间。全谷物、豆类、蔬菜和水果都是膳食纤维的良好来源。
Next, let's talk about dietary fiber. Dietary fiber can promote intestinal peristalsis, help expel harmful substances from the body, and reduce the retention time of carcinogens. Whole grains, legumes, vegetables, and fruits are all good sources of dietary fiber.
此外，一些特定的植物化学物质也值得我们关注。比如，大豆中的异黄酮能够抑制癌细胞的生长；绿茶中的茶多酚则具有抗氧化和抗炎作用，有助于预防多种癌症的发生。
In addition, there are some specific phytochemicals that deserve our attention. For example, the isoflavones in soybeans inhibit the growth of cancer cells; The tea polyphenols in green tea have antioxidant and anti-inflammatory effects, which help prevent the occurrence of many cancers.
当然，我们也不能忽视维生素和矿物质的作用。维生素E、硒等营养素能够增强免疫力，保护细胞免受损伤。坚果、种子、鱼类和瘦肉都是这些营养素的良好来源。
Of course, we can't ignore the role of vitamins and minerals. Nutrients such as vitamin E and selenium can boost immunity and protect cells from damage. Nuts, seeds, fish, and lean meats are all good sources of these nutrients.
那么，如何在日常饮食中合理搭配这些食物成分呢？我建议大家遵循“彩虹饮食”原则，即多吃各种颜色的蔬菜和水果，以确保摄入多样化的营养素。同时，适量摄入全谷物、豆类和坚果，保持均衡的饮食结构。
So, how do you mix these food ingredients in your daily diet? I recommend that you follow the "rainbow diet", which is to eat plenty of vegetables and fruits of all colors to ensure a variety of nutrients. At the same time, eat whole grains, legumes and nuts in moderation and maintain a balanced diet.
最后，我想强调的是，虽然食物中的抗癌成分具有一定的预防作用，但并不能完全替代医疗手段。因此，在保持健康饮食的同时，我们还应该定期进行体检，及时发现并治疗癌症等慢性疾病。
Finally, I would like to emphasize that although the anti-cancer ingredients in food have a certain preventive effect, they are not a complete substitute for medical treatment. Therefore, while maintaining a healthy diet, we should also have regular medical check-ups to detect and treat chronic diseases such as cancer in a timely manner.
总之，通过合理搭配食物成分，我们完全可以在日常饮食中融入抗癌的元素，为自己的健康加分。让我们从今天开始，更加注重饮食健康，共同抵御癌症的威胁吧！
In short, through a reasonable combination of food ingredients, we can completely integrate anti-cancer elements into our daily diet and add points to our health. Let's start today and pay more attention to eating a healthy diet to fight the threat of cancer together!
谢谢大家！
Thank you!