He's such an egghead, always buried in his books and ignoring the world around him.
他真是个书呆子，总是埋头于书本，忽视周围的世界。
During the study group, the egghead in the class explained the complex theory in a simple way.
在学习小组中，班里的书生用简单的方式解释了复杂的理论。