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ADJ-GRADED
不可触动的；不受影响的；碰不得的
If you say that someone is untouchable, you mean that they cannot be affected or punished in any way.
例句
I want to make it clear, however, that no one is untouchable in this investigation.
但我想说明白一点，这次调查谁都逃不了。
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ADJ
高人一等的；无与伦比的；无可匹敌的
If you describe someone, especially a sports player or entertainer, as untouchable, you are emphasizing that they are better than anyone else in what they do.
例句
A lot of the players began to feel they were untouchable.
许多球手开始觉得自己天下无敌。
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N-COUNT
不可接触者，贱民（指印度社会最低阶层的人）
Some people refer to Hindus of the lowest social rank as untouchables .
例句
He was born an untouchable in a very poor village in south India.
他出身贱民，生于印度南部一个非常贫困的村子。