We advocate recycling papers and plastics.

我们提倡循环利用纸张和塑料。

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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。

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Lastly, up here, is a picture of a much smaller device, this is actually an artificial heart valve that is made of plastics and metal and can replace the valve inside your heart.

最后,在上面这里,这张图片是一个相对较小的装置,这实际上是一个人工心脏瓣膜,由塑料和金属制成,可以取代人的心脏瓣膜

耶鲁公开课 - 生物医学工程探索课程节选

Things like steel and polymers, or plastics, and ceramics, and of course computers which has progressed remarkably due to the work of engineers in your lifetime, until now you can carry around a cell phone, which would have been unthinkable even 30 years ago.

包括钢铁,聚合物,塑料,陶瓷,当然,计算机这个在你们的有生之年,已经取得令人瞩目的进展的发明,也得归功于工程师的工作,现在你们的手机能随身携带,而这在三十年前是不可想象的

耶鲁公开课 - 生物医学工程探索课程节选

The Midland, Michigan-based company still gets 40% of its revenues from basic commodity chemicals and plastics.

FORBES: Chemical transformation

Both metals and plastics are traded in bulk form, before they are turned into finished products.

ECONOMIST: The LME graduates to plastics

The university in nearby Bologna, for example, is helping it to develop special steels, composites and plastics.

ECONOMIST: Italian champions (2)