原文:At the end of last century, an important discovery was make that everythiing was built partly of electrons.译文:上世纪末有 ,即一切东西都有一部分是由电子构成的。

原文:At the end of last century, an important discovery was make that everythiing was built partly of electrons.译文:上世纪末有______, 即一切东西都有一部分是由电子构成的。