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 ...
despair (n.) c. 1300, from Anglo-French despeir , Old French despoir , from desperer (see despair (v.)). Replaced native wanhope . despair (v.) early 14c., from stem of Old French desperer ...