It's the first satellite to orbit a comet, and to escort it throughout its whole tour through the solar system -- closest approach to the sun, as we will see in August, and then away again to the exterior.
它是首个进入彗星轨道的人造卫星， 并且伴随彗星走过了 它的整个太阳系之旅—— 到达了距离最短的近日点， 这个我们将会在8份看到， 然后重新离开太阳系。