chiaroscuro
/kɪˌɑːrəˈskjʊərəʊ/noun
mass noun
1- the treatment of light and shade in drawing and painting（素描、油画）明暗对比法。
1.1
- 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.
卵石路明暗交错的光效应。
词源
mid 17th cent.: from Italian， from chiaro 'clear， bright' （from Latin clarus）+oscuro 'dark， obscure' （from Latin obscurus）.