Scientific rigor must never be compromised by commercial pressures.
If time travel is possible, where are the tourists from the future?
金银像其他商品一样具有内在价值,这不是任意的,而是取决于它们的稀缺性、获取它们所耗费的劳动量以及生产它们的矿山所投入的资本价值。
Our mission is to make the world more open and connected.
解释:国家大而政绩小,国家的影响就跟它的政绩一样;国家小而政绩大,国家的地位也大。