It is a well-known fact that a person will move in a circle when he cannot use his eyes to control his direction.
本句翻译：一个人若不用眼睛来掌握走路的方向，就会走成一个大圈。这一事实是众所周知的。
That move along the unit circle to the diagonal, and then I move back to the origin in a straight line.
然后沿单位圆的圆弧走到对角线处，接着这直线回到原点。
In the defs element I've added a path element that defines a circle for the rocket to move around.
在defs元素中，我添加了一个path元素，用于定义火箭移动所沿着的圆圈。
Move the helicopter to the right, keeping the tail pointed away from the pilot, in a circle around the pilot. Until the helicopter is hovering over the take-off point.
保持机头朝向操控者，以操控者为圆心，以顺时针的方向执行水平圆的动作，直到直升机到达起飞点的上空。
Move the helicopter to the right, keeping the tail pointed away from the pilot, in a circle around the pilot. Until the helicopter is hovering over the take-off point.
保持机头朝向操控者，以操控者为圆心，以顺时针的方向执行水平圆的动作，直到直升机到达起飞点的上空。
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