食物必须在卫生的环境中制作。Food must be prepared in hygienic conditions.我愿称它为世界最不卫生的地区之一.I would call it one of the most unsanitary areas in the world.干吗不趁服务员打扫卫生的机会就在这儿会面 呢 ? ”Why don't you meet in here while the waiters are cl...
铁和铝的化合物成为一种体积庞大的蓬松的游渣沉淀下来.Iron and aluminum compounds precipitate as a voluminous sludge.今天铝的用途多得不可胜数.Today, the uses of aluminum are innumerable.这些反映包括进入的配位体对铝的d空轨的电子给予作用.These reactions involve electrondonation from th...