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.
他们的记忆是保存了他们的足迹在地面上的投影。
Their memory is preserved by the projection of their footprint on the ground.
她喃喃呓语，月亮沉默着洒下柔和的光芒，在地面上投影出一个圆。
She muttered nonsense, silent moon shed a soft light, projected on the ground out of a circle.
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