基于双代数的物体投影重建方法是一种隐式重建方法。
Projective reconstruction based on double algebra is an implicit method.
把光敏电阻传感器对准地面，扫清地面上的障碍——你的机器人会避开在行进路线上的物体投影。
Aim the photoresistors on the ground and you have instant obstacle avoidance - your robot will avoid the shadows cast on the ground by objects in the way.
御夫座ε星每27年就会发生一次蚀变，科学家们趁此良机拍下了它的特写照片，通过照片他们发现有一片奇怪的黑色物体投影在该星体上。
Scientists taking close-up photographs of the Epsilon Aurigae during its eclipse, which happens every 27 years, noticed the strange dark object's shadow on the star.
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