... perpatic 过多基质的 perpendicular angle 直角 perpendicular array 正交排列 ...
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ladder angle with the perpendicular 阶梯与垂直的角度
perpendicular angle
垂直的角度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The severity of the laboratory test was equivalent to an oblique collision with the rocky surface of the Earth - a comet coming in at an angle of less than 25 degrees from the horizon, rather than head on (perpendicular to the Earth's surface).
BBC: Comets could have seeded life on Earth
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