To get there Rosetta had to do several planetary flybys before heading out towards the asteroid belt.

要抵达彗星所在位置，罗塞塔需要做几次行星（定点）飞跃，然后向小行星带进发。

The phenomenon was discovered on previous flybys by Voyager spacecraft, but Galileo determined how plentiful and persistent the eruptions are.

这个现象早先就被经过的航行者号发现过，但伽利略号却更详细地展示了这些爆发是多么的壮观和持久。

Messenger was launched more than six years ago, travelling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.

信使号于六年前发射，穿过太阳系内部，飞越地球、金星和水星。

The spacecraft began its journey more than six years ago, traveling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.

该航天器与六年前启程航向内太阳系，并对地球、金星和水星从事飞近探测。

The spacecraft will orbit about once every 12 hours and fill in the visual gaps left by it's two earlier flybys and the images snapped by Mariner 10 between 1974 and 1975.

它每十二小时绕水星一周，将填补早先它两次飞掠和水手十号1974、1975年照片的视觉视角。