viewer identification
观众识别
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Soccer and basketball players, unlike football and hockey players, are facially exposed (i.e. unmasked) which helps with fan and viewer identification.
FORBES: All-German Match, Absence of Messi and Ronaldo Will Hurt U.S. TV Ratings for 2013 Champions Final
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