He was studying the complex similarities and differences between humans and animals.

他在研究人和动物之间错综复杂的相似与不同之处。

Scuffles broke out between police and demonstrators.

警察和示威者之间发生了冲突。

I sat down between Jo and Diana.

我在乔和黛安娜中间坐下。

Clashes broke out between police and demonstrators.

警方与示威者发生了冲突。

This plant blooms between May and June.

这种植物在五六月间开花。