
Cardboard (硬纸板) boxes are often dirty. They carry germs and bugs. Old cardboard boxes pollute (污染) the air. What’s worse, they may bring small bugs into your house.
You should open your parcels (包裹) outside. After opening a box, remember to wash your hands. Do not store old boxes for a long time. Just throw them away.
These good habits keep your house clean and your family healthy.