ri·ant /ˈraɪənt, ˈri; riˈɑn/
 (a.)微笑的,愉快的,快活的
 Ri·ant a.  Laughing; laughable; exciting gayety; gay; merry; delightful to the view, as a landscape.
    In such cases the sublimity must be drawn from the other sources, with a strict caution, howewer, against anything light and riant.   --Burke.
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 riant
      adj : showing or feeling mirth or pleasure or happiness; "laughing
            children" [syn: laughing(a)]