Earth's surface is not made up of a singlesheet 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
This limitation derives from the fact that most touch-screen displays today use a singlesheet of glass as the top layer.
这一局限性源自这样一个实际情况，那就是如今的大多数触屏显示器最表层单有一片玻璃。
3
Can you explain your idea to someone within 5 minutes using no more than a singlesheet of paper and a crayon as visual aids?