Back then, there had been a bigtractor tire hung from a rack to mark the circle (back in Eagle Plains, I had seen the photos of the tire).
当时，出现了大拖拉机轮胎悬挂在机架上，标志圆(在鹰平原，我看到了照片的轮胎)。
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For asteroids too big for a robot to handle, a large spacecraft could fly near the object to act as a gravity tractor that deflects the asteroid's trajectory, sending it toward Earth.
For asteroids too big for a robot to handle a large spacecraft could fly near the object to act as a gravity tractor that deflects the asteroid's trajectory sending it toward Earth.