没有这六次“飞经”（利用各行星重力场的作用），就没办法使信使号降到能滑进水星轨道的速度。
Without its six fly-bys—which used the gravitational fields of the planets involved to counter that effect—Messenger could not have slowed sufficiently to allow it to drop into its intended orbit.
根据一种假设，这颗行星的重力场会对由尘埃和气体组成的原行星盘产生牵引力。
According to one hypothesis, the planet's gravitational field tugs on the protoplanetary disk of dust and gas from which it formed.
该防御场破坏任何接近星际煅炉的电子设备，导致飞船被拉卡塔行星的重力场捕获。
The field disrupted any electronic equipment that approached the Star Forge, causing ships to be caught in the gravitational field of the Rakatan planet.
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