Air travel makes some people very nervous. The crowds, the noise and flying itself can cause unease (不安). But there are classes people can take to help them overcome the fear of flying. And there is similar training for service dogs that suffer the same problem.
Service dogs almost never leave the side of the people they care for. You will see them working on buses, trains and other public systems. But the busy environment found at an airport can cause dogs ants in their pants even the best trained working ones. People with disabilities depend on their dogs. They want the animals to safely guide them through safety areas. They also need the dogs to remain calm on duty on the airplane, even when the flying is not smooth. This takes special training.
The Air Hollywood K9 Flight School is one place where such help can be found. The school has a piece of equipment (设备) that provides the sights, sounds and even the feel of an airplane in flight. Dog trainers say training is based on a simple rule: preparation. Dogs need to be trained gradually to the environment, to loud noises, to sounds and other dogs so that when this experience happens to them on a daily basis, they're able to act in a way that they're used to acting and that they don't get excitable. Dog owners who attended the training at Air Hollywood K9 Flight School say they now feel much more at ease about future flights. Their dogs also seem ready for take—off.
What is the life in the desert like? You may think there is only sand in the desert of the world, but it is not true. In the desert, there is a little rain, but it is not enough for most plants. Still we can see some plants live in the desert.
There is water in some places in the desert. We call these places oases (绿洲). In the oases, there are villages and towns. People grow all kinds of crops in the fields there. People also lie outside the oases. They have camels (骆驼), sheep and other animals. These animals depend on the desert plants for their food and do not need much water.
The animals are useful to the desert people in many aspects (方面). They eat the meat and drink the milk of the animals. They use the camels for carrying water, food, tents and something else.
The desert people have to keep moving from place to place. They must always look for grass or desert plants for the animals. When there is no more food for their animals, they move to other places. The desert people are friendly. People in the desert are glad to help the people in trouble and give them food and water.
Without energy in our bodies, we wouldn't be able to do anything. We couldn't walk, talk, or even play. Energy is usable power. And energy is related to some kind of motion.
All living things need energy, no matter what they do. Plants get their energy from sunlight. This energy is stored indifferent chemicals（化合物)inside the plant.
Animals that eat plants take the energy stored in the plants. The energy is then stored in chemicals inside the animals as "food energy". The same happens when animals eat other animals.
Plants and animals use energy every day as they grow and do the work of being a plant or an animal. So plants have to keep absorbing(吸收)sunlight, and animals have to keep eating plants or other animals.
It isn't only living things that have energy. A dead tree has hidden energy. When we burn its wood, it gives off warmth, or "heat energy". The Sun too makes heat energy as it keeps burning.
The Sun gives off not just heat but also light, as "light energy". A battery in a flashlight makes it shine, generating light energy. But if we put the same battery in a radio, we get music. A battery's energy is known as "electrical energy". And in a toy car that electrical energy produces movement.
If we couldn't use heat, light, or electrical energy, we couldn't drive cars or cook food. We wouldn't have light at night time.
Southern white rhinos (犀牛) mainly live in Africa. They are very large in size, about 4 metres long, 1.75 metres high, and over two tons in weight. There are two horns (角) on the nose. The front horn is over half a metre long, while the other one is smaller. Southern white rhinos are not really white. They are grey in colour. "White " may come from the Afrikaans word for "wide ". It has some connection with their wide mouths.
Southern white rhinos live on grass, leaves, fruit and so on. They have very poor eyesight. However, they have good hearing and an excellent sense of smell. Their skin (皮肤) is nearly 5 cm thick but is very sensitive. During the day, they try to find a cool place to avoid sunburn. Southern white rhinos lie in mud (泥浆) when they can, as it sticks to their skin and protects them from the bright African sun.
Some humans kill rhinos for their horns. They sell horns to those who believe horns have magic powers or can treat sickness. It puts southern white rhinos in danger.
Now many actions are taken to protect southern white rhinos. The international trade in rhino horn has been stopped in the world. Besides, many protected areas have been built, especially in South Africa. Up to 2020, more than 20 countries have made rules to protect southern white rhinos. Today the number of southern white rhinos has increased to over 20,000 in the wild.
