但即使我们目光放在最底层的10%或20%美国人身上，我们也还是很难辨认出谁才是真正的穷人，因为这个群体的构成是经常变动的。
But even if we focus on the bottom 10 percent or 20 percent of Americans, it would still be difficult to identify who the poor are, because the composition of this group changes constantly.
说话人辨认系统的目的是提取、特征化和辨认表征说话人身份的语音信号信息，因此它在身份验证领域具有广阔的应用前景。
The goal of speaker identification systems is to extract, characterize and identify the information in the speech signal conveying speaker identity.
说话人辨认系统的目的是提取、特征化和辨认表征说话人身份的语音信号信息，因此它在身份验证领域具有广阔的应用前景。
The goal of speaker identification systems is to extract, characterize and identify the information in the speech signal conveying speaker identity.
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