Mammoths were herbivorous mammals.是什么意思？

Mammoths were herbivorous mammals.

猛犸是食草性哺乳动物。

Mammoths

ADJ-GRADED （改变）巨大的，重大的；（任务）庞大的，艰巨的；N-COUNT 猛犸，毛象（一种史前动物）；

例句
Neanderthal man was able to kill woolly mammoths and bears.
尼安德特人能够捕杀浑身覆毛的猛犸象和熊。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

herbivorous

adj. 食草的；

例句
Mammoths were herbivorous mammals.
猛犸是食草性哺乳动物。

mammals

n. 哺乳动物( mammal的名词复数 )；

例句
No mammals other than people may enter the country without lengthy quarantine.
除人之外，所有的哺乳动物进入这个国家都必须经过长期隔离。