既然重力改变了，走路也的确需要练一练了。
Walking does need a bit of practice now that gravity has changed.
科学家们认为这个速度加上行星的重量屈服于强大的重力牵引力，可以改变行星的运行轨道。
Scientists think that this speed coupled with the planet's heft yields strong gravitational tugs that can alter the planets orbit.
四种基本力(重力，电磁力，强作用力和弱作用力)都有一个理论把手，调节这东西可以改变力的强度。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob that can be turned up or down to change its strength.
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