It's closer to the Sun, so the gravity it feels from the Sun is stronger, and therefore its orbital velocity is faster than Earth's.

它离太阳更近，所以它受到的来自太阳的引力更强，因此它的公转速度比地球的要快。

Then, as Mercury pulls away from the Sun, its orbital velocity slows down, and the Sun starts to move west once again as the planet's rotation dominates.

然后，当水星远离太阳时，它的公转速度又变慢，随着自转占据主导地位，太阳又开始继续向西移动。