【简答题】You may have seen a lot of frogs, but if you haven't, you must have heard about frogs. However, have you heard about a frog that can kill a person? These small brightly colored amphibians (两栖动物) live ...
【简答题】You may have heard some respectable elders say, “It’s not what you want in this world, but what you get.” Psychology teaches that you do get what you want if you know what you want and want the right ...
【简答题】You may have never heard of Ladislao Biro, but you have certainly heard of the pen he invented—the ballpoint pen, or biro. Before Biro invented his pen, people wrote with fountain pens. The ink smudge...