倾斜透视的特征:与画面和地平面都成倾斜的面,向上斜和向下倾斜,向上的倾斜线向视屏上方汇集,消失于(),向下的则消失于()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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