The boundary between the two areas acts as a wall, capable of reflecting a guided EM wave on the graphene much like one would in a three dimensional space.

两个区域的边界就像是一堵墙，能反射被引导的电磁波； 这和三维空间中的墙是类似的。

youdao

Fuzzy phenomena often occur in the boundary of time or space, and sometimes in the periphery of a concept.

模糊现象往往出现在时间或空间的边界地区，或概念的边缘区域。

youdao

If a man merely watches the limits of time and space, he will never step over the boundary of the paradigm of life.

如果一个人只看时间和空间的界限，他永远也不能跨越生命的框框的边界。

youdao

Four, it follows an established set of parameters and rules, and requires some artificial boundary of time and space.

NEWYORKER: Master of Play

But we are the only species to have defined a geological period by our activity something usually performed by major glaciations, mass extinction and the colossal impact of objects from outer space, like the one that defines the upper boundary of the Cretaceous.

FORBES: On The Anthropocene Age