Arc observation window 弧光观测窗
George watched them, through the window, pass under the arc-light and across the street.
乔治从窗户里面望着他们在弧光灯下经过，走到街对面去。
The arc shaped door opening and side window added foreign sentiment to the "small town", which enabled people to play freely by shuttling back and forth.
小屋门洞和侧窗的圆弧造型为“小镇”增添了几分异国情调，顾客可以自由穿梭游玩。
The cutting object is complicacy geometry entity, which is complicacy polygon with arc, arc boundary and hole, the cutting window can be cave or convex polygon.
该方法中的被剪切对象是较为复杂的几何实体，包括圆弧以及带有圆弧边界和带有洞的复杂多边形对象，其中剪裁窗口可以为凹多边形或凸多边形。
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