colour something in
phrasal verb with colour verb UK (US color) uk/ˈkʌl.ər/ us/ˈkʌl.ɚ/
给…上色，给…填色，给…着色
to fill an area with colour using paint, coloured pencils, etc.
Rosie drew an elephant and coloured it in. 罗西画了一头大象，然后给它上了色。
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