State authorities have ordered cutbacks in deliveries of water from the delta because of the threat to endangered species of salmon and smelt .
由于鲑鱼和胡瓜鱼这些濒危物种受到威胁,国家当局已经要求消减从该三角洲往外输水的量。
With a furnace in your home , you 'll be able to smelt more precious ores like iron , gold and silver .
当你家中有一个熔炉时,你就能够熔化一些更贵重的矿物,比如铁、金和银。
However , there are far fewer copies of the textbooks and manuals and blueprints containing the kind of distillation of specialised knowledge that might matter most to those trying to rebuild civilisation , such as how to smelt iron or make antibiotics .