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Cameras can take pictures. Our eyes are like a camera. When we open them， they begin to take pictures. Then they send the pictures to our brain（大脑）. They work like this.
the actual（实际的） tree
1. Eat the right food. Carrots， liver（肝脏） and milk have a lot of vitamin（维生素） A. They can make your eyes see better.
2. Don’t watch a computer or TV for too long. Exercise your eyes.
3. Turn on lights when it’s getting dark， especially when you are reading.
4. Tell your teacher if you can’t see the blackboard clearly.
5. Wear sunglasses and a hat on sunny days.
6. Don’t wear other people’s glasses.
* Never throw sand（沙子） or small things at others.
* Never fire（发射） anything such as toy guns（玩具枪） or paper planes at others.
* Never run with pointy（尖的） things like pencils or scissors in your hands.
1. The giant squid（巨型乌贼） has the largest eyeball（眼球）. Its eyeball can be as large as a watermelon.
2. Dogs can’t see the difference between the colors red and green .
3. A chameleon’s（变色龙的） eyes can look in different directions（方向） at the same time.
4. An ostrich’s（鸵鸟的） eye is bigger than its brain.
5. Many hamsters（倉鼠） only blink（眨眼） one eye at a time.
the actual（实际的） tree
1. Eat the right food. Carrots， liver（肝脏） and milk have a lot of vitamin（维生素） A. They can make your eyes see better.
2. Don’t watch a computer or TV for too long. Exercise your eyes.
3. Turn on lights when it’s getting dark， especially when you are reading.
4. Tell your teacher if you can’t see the blackboard clearly.
5. Wear sunglasses and a hat on sunny days.
6. Don’t wear other people’s glasses.
* Never throw sand（沙子） or small things at others.
* Never fire（发射） anything such as toy guns（玩具枪） or paper planes at others.
* Never run with pointy（尖的） things like pencils or scissors in your hands.
1. The giant squid（巨型乌贼） has the largest eyeball（眼球）. Its eyeball can be as large as a watermelon.
2. Dogs can’t see the difference between the colors red and green .
3. A chameleon’s（变色龙的） eyes can look in different directions（方向） at the same time.
4. An ostrich’s（鸵鸟的） eye is bigger than its brain.
5. Many hamsters（倉鼠） only blink（眨眼） one eye at a time.