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他的才智和头脑的敏锐从未被受到怀疑。
His intellect and mental agility have never been in doubt.
《柯林斯英汉双解大词典》
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对这种差异的怀疑存在已久，但是从未被证实过。
Such differences had long been suspected but never proven.
youdao
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对这种差异的怀疑存在已久，但是从未被证实过。
Such differences had long been suspected but never proven.
youdao