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。
金属可以被重复利用。
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。
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。
Charles Boutron is an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France.
查尔斯·布特隆是法国国家科学研究中心的一名专家，研究重金属对环境影响。
The process is possible only with certain materials (plastics, resins and metals) and with a precision of around a tenth of a millimeter.
这个过程只能用特定的材料（塑料，树脂和金属），精度在0.1毫米左右。
We are talking about the Neolithic period here, which was the time before stone tools began to be replaced by tools made of bronze and other metals.
我们这里在说的是新石器时代，是石器开始被青铜和其他金属制工具所取代之前的那个时代。
Trading was important, as so many raw materials, the semiprecious stones for the decoration of the temples, timbers for roofs, and all metals, had to be imported.
由于大量原材料，如用于装饰庙宇的半宝石石料、建造屋顶的木材和所有金属都需要进口，贸易变得至关重要。
Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.
研究这种药草的农学家发现，它会产生大量的组氨酸，这种氨基酸在试管溶液中会使这些金属具有化学惰性。
We must imagine the early Earth as a mixture of rocky materials, metals, and trapped gases, subject to constant bombardment by smaller planetesimals and without much of an atmosphere.
我们必须想象早期的地球是岩石材料、金属和封闭气的混合物，受到较小的星子的持续轰击，没有多少大气。
Many are found in tropical and subtropical areas of the world, where the accumulation of high concentrations of metals may afford some protection against plant-eating insects and microbial pathogens.
许多超富集植物被发现于热带地区和亚热带地区，在那里，高浓度金属元素的积累可以为植物提供保护来对抗以植物为食的昆虫和细菌病原体。
Some of the most common things in use today include recycling plastic glass, metals and paper.
目前使用的一些最常见的东西包括回收塑料玻璃、金属和纸张。
A whitesmith is a person who works with "white" or light-colored metals such as tin and pewter.
金属抛光匠是使用“白色”或浅色金属（例如锡和白镴）的人。
The catalysts can divide into two kinds: the transition metal bifunctional catalysts and oxycarbide catalysts of transition metals.
催化剂可以分为两种：过渡金属双官能催化剂和过渡金属的碳氧化物催化剂。
Copper and gold are both metals.
铜和金都是金属。
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