Raw water can't be drunk directly, and unwashed apples can't be eaten directly. Why can apples washed with raw water be eaten directly?

The first sentence "tap water can't be drunk": This is because there are bacterial impurities in the unboiled tap water (even if the water plant is treated well, there will still be secondary pollution such as pipes), and direct drinking will threaten human health.

The second sentence "apples can't be eaten directly": There is nothing wrong with this sentence. There will be dust, pesticides and germs on the surface of unwashed apples, and there is also a risk of stomach disease if you eat them directly.

The third sentence "apples washed with tap water can be eaten": this sentence has pits. People who are confused may not pay attention. The amount of tap water drunk is completely different from the amount of tap water left after washing apples. Washing apples with tap water can greatly reduce the dirt left on apples, and of course, it will leave a little tap water. But compared with drinking tap water (50ml, not too much), these drops of water left by washing apples are really too few. Even if there are impurities and bacteria in these water droplets, they are insignificant to our human body and do not pose a threat. When we talk about toxicity, we should also talk about dosage. You don't understand this truth.

To sum up, although washing apples with tap water is not very clean, it is not much better than not washing them. In fact, the best way is to scald apples with boiling water. After all, hot water can kill bacteria.