The idea here is that - while Earth formed slowly from planetary embryos colliding - Mars is itself a solitary planetary embryo that formed very early in the history of our solar system.

这里想表达的观点是，当地球从行星胚胎间相互碰撞缓慢形成时，火星却是一个孤独的行星胚胎，在太阳系历史上形成得很早。

youdao

Although our solar system only has one star, most stars like our sun are not solitary, but are binaries where two stars orbit each other a pair, or multiples involving even more stars.

虽然我们的太阳系只有一颗恒星，但其实大部分和我们太阳相似的恒星都不是单个的，而是由两个恒星相互旋转组成的双星系统，或者甚至包含更多恒星的多星系统。

youdao

A similar system might ease the pressure on the solitary round-the-world yachtsmen, he adds.

他补充说，类似的系统可以舒缓全球各地帆船水手孤单扛负的紧张压力。

youdao

The discovery of a true planetary system, as opposed to the solitary planets that are known to orbit a dozen or so other stars, is significant for two reasons.

ECONOMIST: Planet hunting