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The Science of Hand Washing
洗手的科学
Washing hands is common practice for maintaining good hygiene and preventing disease.
洗手是保持良好卫生和预防疾病的常见做法。
However, studies show that many people still don't wash their hands properly.
然而，研究表明，许多人仍然不了解正确的洗手方法。
Rinsing with water is not enough to eliminate viruses.
仅仅用水冲洗不足以消除病毒。
This is because viruses can adhere to skin, and the friction caused by rubbing hands together is not always enough to remove them.
因为病毒可以附着在皮肤上，而双手摩擦产生的摩擦力有时候不能够消除病毒。
The molecules in hand soap are able to break the virus away from the skin.
洗手液中的分子能够将病毒从皮肤上分离出来。
These molecules can then kill the virus by breaking the bonds that hold it together.
然后，这些分子可以通过破坏病毒结构来杀死病毒。
It is recommended that people wash their hands for over twenty seconds with soap and water.
专家建议用肥皂和水洗手，时间控制在20秒以上。
Drying hands is also important, because wet hands can transfer bacteria to surfaces more easily than dry hands.
洗手后把手擦干也很重要，因为湿手比擦干后更容易留下细菌。
Some people use hand sanitizer instead of soap to prevent disease.
有些人用洗手液代替肥皂来预防疾病。
While hand sanitizer can be effective against bacteria and viruses, medical professionals agree that it is not quite as effective as soap and water.
虽然洗手液也可以有效对抗细菌和病毒，但医学专业人士一致认为，肥皂和水比洗手液更有效。
