November 13，1971， The American space probe, Mariner 9, has become the first spacecraft to orbit another planet, swinging into its planned trajectory around Mars without a hitch.

1971年的11月13日，美国宇宙飞船水手九号顺利进入火星的计划轨道飞行，成为首架环绕另一颗行星飞行的宇宙飞船。

youdao

Free trajectory - didn't even go into orbit.

自由轨道—还没有进入轨道。

youdao

Tell me it's orbit? trajectory and I won't live in those locations, just in case.

为了以防万一，告诉我火箭的轨道轨迹。我不想在它飞过的地方住。

youdao

Meteorological and ground observation satellites also follow the path Sir Arthur mapped out, and the term Clarke Orbit is sometimes used to describe their trajectory.

BBC: NEWS | Technology | Arthur C Clarke: predictions

In addition, Messenger will use this lap around Mercury to help put the spacecraft on a trajectory to help it return to orbit around the planet permanently by 2011.

NPR: New Images May Shed Light on Mercury's Mysteries

To reconstruct the meteor's original orbit around the Sun, they used six different properties of its trajectory through Earth's atmosphere.

BBC: Russia meteor's origin tracked down