Metals expand when they are heated.
金属受热会膨胀。
Zinc is used to protect other metals from corrosion.
锌被用来保护其他金属免受腐蚀。
Low temperature contracts metals.
低温使金属收缩。
Lead is one of the softer metals.
铅是硬度较低的金属之一。
金属可以被重复利用。
Gold and silver are tractable metals.
金和银是容易加工的金属。
Iron and some nickel, both of which are metals.
铁和一些镍，它们俩都是金属。
Metals are opaque, so the other electrode must be transparent.
金属是不透明的，因此另一个电极必须是透明的。
There were few natural resources, no timber, stone, or metals.
那里几乎没有什么自然资源，也没有木材、石头或金属。
Electronic devices contain valuable metals such as gold and silver.
电子设备含有贵重金属，如金和银。
Electronic products contain valuable metals that could be recovered.
电子产品内含有价值的可回收金属。
This is partly driven by the rising price of raw materials and metals.
这在一定程度上是受原材料和金属价格上涨的推动。
In order to be purified, or combined into alloys, metals must be melted.
为了净化或合成合金，金属必须熔化。
Together, the value of these metals is estimated to be about $52 billion.
这些金属的总价值估计约为520亿美元。
They and colleagues have invented a way for damaged metals to heal themselves.
他们与同事研发出了一种能让受损金属自我愈合的方法。
The value of the metals, like gold and silver in the waste around the world, is amazing.
像世界各地废料中的金银这类金属，价值惊人。
Scientists have strived to find a solution by mixing it with expensive metals such as nickel.
科学家们一直在努力寻找一种解决方案，将其与镍等昂贵金属混合使用。
They can thrive in soil with high concentrations of metals that are toxic to most other plants.
它们能在含有对大多数其他植物有毒的高浓度金属的土壤中茁壮成长。
These asteroids are like the terrestrial planets, in that they're composed mostly of rocky material and metals.
这些小行星像类地行星一样，主要由岩石物质和金属构成。
Engineers like ceramics because they can be heated without melting, unlike metals and plastics, though, they are brittle.
工程师们喜欢陶瓷，因为陶瓷在加热时不会熔化，但与金属和塑料不同的是，陶瓷易碎。
It would have been relatively easy for a person with knowledge of metals to melt down bronze objects and forge them into coins.
对懂金属的人来说，熔化青铜制品并将其锻造成硬币是相对容易的。
The market for recycled commodities like aluminum and other metals remains strong despite economic changes in the recycling industry.
尽管回收行业发生了经济变化，但铝和其他金属等回收商品的市场依然强劲。
The market for recycled commodities like aluminum and other metals remains strong despite economic changes in the recycling industry.
尽管回收行业发生了经济变化，但铝和其他金属等回收商品的市场依然强劲。
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