草场“轮休”Hints: 无Grasslands need time to rest when cattle and other animals feed on them. Moving animals from one area of pasture to another can provide the time needed for new growth. This i...

降温也要给树木保暖Hints:University of Arizona Extension University of California FloridaJim BottcherUniversity of Florida Extension Cold weather is most likely to damage or kill plants that do no...

气温下降时作物和树木的保暖Hints:Floridathe Sunshine StateBrazilArctic Air Florida, in the southeastern United States, is called the Sunshine State. It grows more oranges than anyplace except Bra...

今晚，当你在倒数计时、庆祝新年时别忘了抬头看看天空上那一轮满月——这是本月的第二轮满月，也就是英语俗语中的“蓝月”。上一次“蓝月”出现在新年夜还是在20年前的1990年，而它下一次在新年夜出现将要等到2028年。

气候变化的妥协（2） Hints: Copenhagen India's environment minister praised the united position taken by India, China, Brazil and South Africa. He said it permitted them to avoid the legally bindi...

气候变化的妥协 Hints: Copenhagen Denmark the United States China India Brazil South Africa Obama carbon dioxide degrees Celsius Almost 200 countries met for two weeks at a United Nations confere...

亚非非法捕杀犀牛行为增加。 Hints: South Africa rhino Asia India Nepal CITES Wild Fauna and Flora Doha Qatar The report says poaching and illegal horn trade has increased in South Africa even wit...

亚非地区非法偷猎犀牛活动日益猖獗。 Hints: Vietnam the International Union for the Conservation of Nature Traffic ZimbabweA new report says the illegal killing of rhinos for their horns is incre...

鲤鱼过多成问题，美国官员找对策。 Hints: the Great Lakes Michigan Mississippi Midwest Utah Provo June sucker The barrier, however, may not be enough to protect the Great Lakes. There are calls in...

美国官方寻找鲤鱼问题的解决办法。 Hints: Mississippi Great Lakes Michigan Army Corps of Engineers Chicago Sanitary Ship Canal Last week our subject was illegal fishing. Now we report on 2 case...