这种矩形机器人，看上去有点像缩小版的太阳能汽车。 它装备着高分辨率的摄像机和传感器，能探测到长的过分高大的树木。
The rectangular robot--looking a bit like a scaled down version of a solar car--is equipped with a high-definition camera and sensors that can detect overgrown trees.
为了克服这个问题，有的学者引入了限制搜索区域的思想，缩小搜索空间，比如椭圆限制、矩形限制等。
In order to overcome this problem and narrow area, some scholars lead into the idea of restricted searching area, such as restrict to ellipse and restrict to rectangle.
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