当时唯一知道的带有正电荷的粒子是质子。

The only particles of positive charge known at that time were protons.

youdao

质子带正电荷，电子带负电荷。

A proton has positive charge and an electron has negative charge.

youdao

电子带负电荷，质子带正电荷。

An electron has a negative charge, a proton has a positive charge.

youdao

电子带有负电荷，质子带有正电荷。

Neutron has no charge, either positive or negative.

youdao

电子带有负电荷，质子带有正电荷。

Neutron has no charge, either positive or negative.

youdao