Polling data are unreliable because few voters would admit to a total stranger -- in this case, a poll interviewer -- that they harbor what might be considered racist sentiments.

• 民意调查数据不可靠是因为选民很少会向完全陌生的人--这里也就是民意调查员--承认他们怀有可能会被认为是种族主义的情绪。