The largest active region seen on the sun since 2005 has rotated to the center of the sun's face, as seen from earth-which means any eruptions it produces will be aimed right at us.
The old man's eyelids, pale and thin like rice paper, flickered. For an instant, his pupils seemed tocenter on the young man's face, then drifted away.
"Online providers face major challenges to get customers to pay for services they now receive for free," said Jeffrey I. Cole, director of the Center for the Digital Future.
“网络线上服务商面临的主要挑战就是：顾客不愿意对他们现在免费获得的服务付费，”数据未来研究中心的主管Jeffrey I . Cole如是说。