“板块”本来是指地球表面的大块岩石，也就是地质学里的大陆板块。

"板块" originally refers to large pieces of rock on the Earth's surface, that is, continental plates in geology.

现在人们也常用它来说一个大的部分或者领域，比如股市里的“科技板块”。

Nowadays, people also often use it to mean a large part or sector, such as the "科技板块" in the stock market.