The scientists detailed their study in two research papers published recently in the journals Physical Review Letters and Physical Review d.

科学家在《物理评论快报》和《物理评论d》期刊最近发表的两篇研究论文里，详细地介绍了他们的研究成果。

youdao

In 2008, Dr Cummer first described the theory of acoustic cloaking in an article in Physical Review Letters, and earlier this year a group from the University of Illinois Urbana-Champaign demonstrated the first practical use of the theory in an article in the same journal.

BBC: Acoustic 'cloaking device' shields objects from sound

As he and his colleagues report in Physical Review Letters, they first tested it with ten texts apiece from ten official languages of the European Union.

ECONOMIST: Computers and language

But unlike dark energy, there are several ideas about what it might be, and one of them is the subject of a second paper, in Physical Review Letters, by Peter Biermann of the University of Bonn, in Germany, and Alexander Kusenko, of the University of California, Los Angeles.

ECONOMIST: Research from the beginning of time