新华社北美总分社 2019年6月21日 WASHINGTON, June 20 (Xinhua) -\- An international team led by Chinese scientists explained why deer are less likely to develop cancer, how reindeer adapt to the harsh environments, and how they produce more Vitamin D...
Professor Valerie Peters teaches the class. Her students help her study coffee farms in an area called Finca la Bella. Farmers in this area agreed to grow their coffee sust...
Now we are going to ask some questions about terms for livestock. What is another name for a male cow? A bull, right? Well, a "bull" can just mean a male cow that has not had its reproductive organs removed. If the animal was castrated as a calf, t...
更多内容请点击：《新华社北美总分社》Chinese researchers map out deer's...