It could have been just as reasonable to expect that there'd be an advantage for speech over sign.
有理由相信,口语比手语更加优越
耶鲁公开课 - 心理学导论课程节选
If there's no tax advantage to one over the other it is completely neutral.
两者之间不再有税赋优惠,完全中性化了
耶鲁公开课 - 金融市场课程节选
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