But prolonged viewing may result in an aching head, according to Dr Michael Rosenberg, an ophthalmology professor at Northwestern University Feinberg School of Medicine in Chicago.
但芝加哥西北大学费恩柏格医学院的眼科学教授迈克尔·罗森堡博士说，长时间观看3d电影可能会导致头痛。
Records of those who paid the head tax are still available for viewing in the National Archives of Canada.
那些交了人头税的人，其档案至今还可以在加拿大国家档案馆查阅到。
A head tax was also imposed. Records of those who paid the head tax are still available for viewing in the National Archives of Canada.
那些交了人头税的人，其档案至今还可以在加拿大国家档案馆查阅到。
A head tax was also imposed. Records of those who paid the head tax are still available for viewing in the National Archives of Canada.
那些交了人头税的人，其档案至今还可以在加拿大国家档案馆查阅到。
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