moulding
noun [ C or U ] UK (US molding) uk/ˈməʊl.dɪŋ/ us/ˈmoʊl.dɪŋ/
装饰线条，线脚;板条
a piece of wood, plastic, stone, etc. that has been made into a particular shape to decorate the top or bottom of a wall, or a door, window, or piece of furniture