1. earth n. 地球 The earth is round. protect v. 保護 energy n. 力量；能源
We should protect our environment.
energy n. 力量；能源
Exercise every day, and you will be
full of energy.

2. noise pollution n.y噪音污染
We should try our best to stop all
kinds of pollution.
air pollution n.空氣汙染
water pollution n. 水汙染
noise pollution n.y噪音污染

3. 3Rs reuse v.再使用 reduce v.減少 recycle v.使循環；再利用
He is trying to reduce the expenses.
reuse v.再使用
We can reuse plastic bags.
recycle v.使循環；再利用
We need to recycle as much trash as possible.

4. Earth Day
Earth Day is a Birthday! Just like a birthday is a special day to celebrate a person, Earth Day is a special day that celebrates the Earth. Earth Day was born on April 22, 1970, in San Francisco, California. Every year, America and over 100 different countries join together in the celebration of Earth Day on April 22nd.

5. What is the 3Rs?
Earth Day is a special day to remind us of the concept, “Think Green and Make the Earth Clean.” Besides, it is also a day to take care of our planet, Earth.
On Earth Day, we remember to appreciate nature and learn ways to protect our environment.
We can keep Earth green and clean by following the rules of “Reduce, Reuse, and Recycle.”