【VOA】コメント記録 1 11 15 21 a hologram is a three-dimensional image -- an image that appears to have height, width and depth. now researchers have developed a holographic telepresence system. the new system might be able to send a moving 3-d image of a person over a distances.
【VOA】コメント一覧 10 4 10 10 2 a survey finds that about half of them do not get enough sleep on school nights. the reason is because teens are biologically programmed to go to sleep later and wake up later than other age groups. many school start classes as early as seven in the morning.