dumbness

His dumbness means that he isn't interest in this kind of things.

他的沉默表明他对这种事情不感兴趣.

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We regard her dumbness as the acknowledgment.

我们把她的沉默看作是同意.

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In particular, the dumbness would appear to be aggravated by stress.

特别是, 压力会让沉默变得更为严重.

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