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
At the start of a game, a number of pieces are placed on the board.
在游戏开始时，棋盘上放着许多棋子。
3
The original number of several thousand pieces has greatly reduced to only a hundred works by today.