Electrons range over a large distance.

电子在一个大范围内活动。

His studies range over several subjects.

他的研究涉及好几个科目。

Animals range over the hills and plains.

动物在山丘和平原上出没。

His studies range over several subjects.

他的研究涉及好几门科目。

His thoughts range over past, present and future.

他想着过去，现在和将来，思绪联翩。