If you track animals or people, you try to follow them by looking for the signs that they have left behind, for example, the marks left by their feet. 跟踪
adjective [原级] 有履带的
He tracked down his cousin and uncle. The latter was sick. 他追踪找到了他的堂兄和叔叔。后者病了。
verb [vt. 及物动词] [计][电子]跟踪，追踪（track 的过去式）
Currently, there aren't many CubeSats and they're tracked closely. 目前，立方体卫星数量不多，都在密切跟踪之下。
