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N-COUNT
兽；野兽
You can refer to an animal as a beast, especially if it is a large, dangerous, or unusual one.
例句
...the threats our ancestors faced from wild beasts.
我们祖先面对的来自野兽的威胁
...a centaur: half man, half beast.
半人半马怪物：一半人身，一半兽形
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N-COUNT
兽性的人；畜生；禽兽
If you refer to a man as a beast, you mean that his behaviour, especially his sexual behaviour, is very violent and uncontrolled.
例句
...a sex beast who subjected two sisters to a terrifying ordeal.
使两姐妹遭受恐怖摧残的色魔
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N-COUNT; N-VOC
讨厌鬼；王八蛋
If you call someone a beast, you think that they are behaving in a selfish, unkind, or unpleasant way.
例句
Bully! Hooligan! Beast! Let me go, let go!
混蛋！流氓！王八蛋！放开我，放开！
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N-COUNT
（含诙谐意）有特定性质的事物，性格特别的人
You can use beast to refer to something or someone in a light-hearted way, and to mention that they have a particular quality.
例句
...that rare beast, a sports movie that isn't boring.
这场体育电影还挺有意思，真难得