Studies of left-handed materials open a series of new challenging problems for theoreticians as well as for experimentalists.

左手材料对科研人员，无论是理论研究还是实验研究，都提出了一系列新的课题。

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None of us knows where to find the first-handed materials.

我们都不知道上哪儿去找第一手资料。

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This work provides a basis to study modes conversion in left-handed materials slab waveguide.

这为研究左手材料薄板波导中的模式耦合奠定了基础。

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Along with other educational materials, he handed out over 600 astronomy bookmarks to members of the public in roughly four hours!

WHITEHOUSE: National Mall Opens to Stargazers

Its cargo then will include broken machinery and science materials that need to be handed back to researchers.

BBC: SpaceX lifts off with ISS cargo

The ceasefire resolutions that ended the Gulf war six years ago decreed that stiff economic sanctions would remain on Iraq, including a ban on the great bulk of its oil sales, until it had handed over all its weapons of mass destruction, along with the equipment and materials to build them.

ECONOMIST: That man again