Đang tải... (xem toàn văn)
Laser is a device which concentrates light waves into an intense light beam.. That book, what is very thick, belongs to my younger sister.[r]
Đang tải... (xem toàn văn)
Laser is a device which concentrates light waves into an intense light beam.. That book, what is very thick, belongs to my younger sister.[r]
Ngày đăng: 13/01/2021, 08:27
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