You might think they are white. But actually, this is not true. According to The Washington Post, although polar bears usually look white,their fur (毛) isn't white at all. And their skin(皮肤)is black!Our hair gets its color because of something called pigment(色素). Different kinds ...
Now,however, the se a ice is becoming water earlier than it used to. There is not as much time for the polar bears to hunt for food. They should have enough fat in their bodies to keep them from getting hungry. Some polar bears,however, haven't been able to get enough to eat. ...
Auroras, also known as the Northern and Southern Lights (aurora borealis and aurora australis, respectively), are natural light displays in Earth's polar regions. They occur when charged particles from the sun — sometimes called solar wind — collide with gases in the Earth's atmosphere, produc...
Polar bears (北极熊) are very big white bears. They live in the Arctic Circle (北极圈) near the North Pole but they do not live at the South Pole. Polar bears live in the snow and ice. At the North Pole there is only snow ice and water. There is no
The Northern lights are one of mother nature’s greatest light shows. An enigma that draws thousands to the northern polar regions each year, inspiring myth, legend and an incomparable sense of awe. What causes this phantom in the night skies over the high latitudes? The story is a complex...
739.It is indeed an honour for China’s scientific research and Chinese medicine to be spread around the world.” 中国的科学研究和中医药得以在全世界传播确实是一个荣誉。 740.Albert Einstein, who is perhaps the greatest...
So, it's important to remember that sometimes your heart rate will be highereven though you feel fine. However, ensuring you areadequately hydratedandfuel your bodyeffectively for your runs is always essential. Polar Vantage M3 Smart Multi-Sport Watch ...
A1. What does the writer imply about female polar bears in Hustoon Bay? A. They are having fewer young now. B. They suffer from varioun sicknesses( They don't need stronger protection. D. They can't find enough good males. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏 ...
SOPs can also be very important for reconstructing project activities when no other references are accessible. Besides, SOPs are commonly used as checklists by inspectors when auditing procedures. Eventually, the benefits of a valid SOP are decreased work effort, along with developed comparability, cr...
Are there northern lights on other planets? Yes! Auroras aren't unique to Earth. They also appear on other planets with magnetic fields and atmospheres. For example: Jupiter has the most powerful auroras in the solar system, driven not only by the solar wind but also by its volcanic moon...