Well, the planet orbits around the sun -- -- in some trajectory.
行星以某轨迹绕太阳运行。
The planet orbits a dim red dwarf star 20 light years from Earth called Gliese 581.
这颗行星所绕行的是一颗暗淡的红矮星，距地球20光年远，名为Gliese 581。
As a planet orbits, it pulls a star back and forth.
当一颗行星绕它的轨道运行时，它能来回牵引恒星。
As a planet orbits, it pulls a star back and forth.
当一颗行星绕它的轨道运行时，它能来回牵引恒星。
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