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WikiPedia: Rãnh_bề_mặt https://www.lpi.usra.edu/lunar/rilles/ https://history.nasa.gov/SP-362/ch6.2.htm http://www.lpi.usra.edu/lunar/rilles/ https://www.oed.com/search/dictionary/?q=rille https://www.oed.com/public/login/loggingin#withyou...