返回

十万个为什么·科学阅读30篇(8)

8 / 30
已读 0 / 30 课
How Does Soap Clean Your Hands?

How Does Soap Clean Your Hands?

肥皂是怎么把手洗干净的?

  1. Soap molecules have two different ends.
  2. One end loves water; the other loves oil and dirt.
  3. When you wash, soap wraps around germs and grease.
  4. Water then carries the soap-dirt bundle away.
  5. Rubbing your hands helps lift dirt from skin.
  6. Rinsing removes soap, germs, and loose particles.
  7. Warm water helps soap work better than cold.
  8. Soap does not kill germs — it washes them off.
上一页
/ 30
下一页