[mass noun]the treatment of light and shade in drawing and painting (素描、油画)明暗对比法 ■an effect of contrasted light and shadow created by light falling unevenly or from a particular direction on something (光照强弱不均或定向光形成的)明暗对比效果 the chiaroscuro of cobbled streets. 明暗交错的石子路。
语源
mid 17th cent.: from Italian, from chiaro 'clear, bright' (from Latin clarus) + oscuro 'dark, obscure' (from Latin obscurus)