All the people were asked about their use of pesticides, chemical fluids and metals like iron.

VOA: special.2009.04.07

All the components that make up the coffee, and all the impurities, etcetera. cadmium, heavy metals, arsenic, whatever is in your coffee.

以及所有的杂质等等，钙，重金，砷，任何在你咖啡里的东西。

麻省理工公开课 - 热力学与动力学课程节选

I'm interested in nonaqueous electrochemistry, so molten salts and polymers, the applied research. First of all, interested in environmentally sound technologies for extraction, refining, recycling of metals.

我对非水溶剂电化学感兴趣，还有熔盐和聚合物，以及应用性研究，首先，对环保型技术提取感兴趣,如金属的提取和精炼，以及循环回收。

麻省理工公开课 - 固态化学导论课程节选

- So, for example, if he was talking about the group one metals, he noticed these were all very soft reactive metals, those were grouped together.

比如，他在讨论，I，族金属，注意到它们都是质地较软的活性金属，这些被归到一类。

麻省理工公开课 - 化学原理课程节选

And, this is all that was known at that time, seven metals, carbon, and sulfur.

这是当时所知道的了，7种金属，碳，和硫磺。

麻省理工公开课 - 固态化学导论课程节选

And, in fact, this is the case for all the alkali metals.

事实上，所有的碱金属都有这样的性质。

麻省理工公开课 - 固态化学导论课程节选