该仪器使用径向速度法来搜索行星。

The instrument searches for planets using the radial velocity method.

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但是，近年来天文学家通过径向速度法去发现或证实大量小到只有几倍的地球质量的行星。

But in recent years astronomers have used radial velocity to find or confirm a number of planets down to a few times Earth's mass.

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行星越重，就越容易通过径向速度法侦测（本质上是行星引力对恒星的扰动）。

The more massive a planet, the easier it is to detect using radial velocity measurements (essentially the star's wobble as a planet's gravity tugs it).

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