focal line 焦线 ; 聚焦线 ; 焦直线
sagittal focal line [光] 弧矢焦线
tangential focal line 切向焦线
meridional focal line [光] 子午焦线
anterior focal line 前焦线
posterior focal line 后焦线
radial focal line 弧矢焦线
line focal
线焦
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Sky and water become the focal elements, always expanding, while the buildings become simply a line of demarcation between them.
WSJ: Appreciating Francesco Guardi's Changing Genres/ A Guardi Retropsective at Museo Correr in Venice
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