Earth's surface is not made up of a single sheet of rock that forms a crust but rather a number of "tectonic plates" that fit closely, like the pieces of a giant jigsaw puzzle.
地球表面并不是由构成地壳的单块岩石构成，而是许多紧密相连的“构造板块”，像一块巨大的拼图。
2
Nanotechnologists could link DNA “tiles” into a sheet, or fold a long strand of DNA back on itself again and again until it formed a flat surface.
纳米技术学家们能够将DNA“砖块”连成一大片，或者将一条长链的DNA反复折叠以形成一个平整的表面。
3
A positive charge applied on the top surfaceof the ink will allow the white to show, making the surface as white as a sheetof paper.