说得具体些，相对论预言，时间并不是按照一个固定频率流动的，它会受到加速度的影响。
Specifically, Einstein's special theory of relativity predicts that time does not flow at a steady rate, and it can be affected by acceleration.
通常我们挂在墙上的东西都是固定的，而不是流动，且不会轻易改动。
Most things we attach to our walls are fixed, not fluid, and cannot be easily moved or changed.
在英国，那种认为阶级地位是十分固定的想法，在收人不均继续加大、社会流动性更加缓慢的情况下，可能更具有破坏作用。
In Britain the perception that class is fairly fixed could become more damaging if income inequality continues to rise and social mobility to slow.
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