re-,向后，往回，-pel,击，打，词源同 compel,propel.引申词义击退，驱逐。

1. Like poles repel, unlike poles attract.

同极相斥，异极相吸。

2. They prepared to repel the invaders.

他们准备赶走侵略军。

3. Two like electric charges repel each other.

同性的电荷互相排斥.

4. As these electrons are negatively charged they will attempt to repel each other.

因为这些电子都带负电，它们将会互相排斥。

5. We derive the important law: opposite charges attract , like charges repel.

我们得到的重要定律是: 异电相吸,同电相斥.