芯

例句：

1. 1. The heartis the core of the human body.
   心脏是人体的核心。
2. 2. The engine's coreis made of high-temperaturealloy.
   发动机的核心是由高温合金制成的。
3. 3.The inner core of the planet is composedmainly of rock.
   行星的内部主要由岩石组成。