质量守恒定律 自然界的基本定律之一 law of conservation of mass 质量守恒定律一般指物质守恒定律(自然界的基本定律之一) Law of conservation of mass generally refers to the law of conservation of matter (one of the fundamental laws of nature) 拉瓦锡, 现代化学之父 Lavoisier ...
thermodynamics (n.) theory of relationship between heat and mechanical energy, 1854 , from thermodynamic (adj.); also see -ics . The consideration of moving forces, though suggested by the form of the word, does not enter into the subject to any considera ...
是宇宙中的恒星多,还是地球上的沙子多?具体算一下得出结果 In perhaps simpler, though still incomprehensible terms, that is 7 quintillion, 500 quadrillion grains . Or in terms simpler still: a lot. In the 1980 bestseller, Cosmos, astronomer Carl Sagan famously wrote: The total number ...
vector 矢量 来自拉丁语vehere,携带,词源同 vehicle ,way,-ct,过去分词后缀。用来指数学名词向量。 英文词源 vector vector: see vehicle vector (n.) quantity having magnitude and direction, 1846; earlier line joining a f ...