以下为句子列表：
英文: For example, methane concentrations fluctuate mainly at the 22,000-year tempo of an orbital cycle called precession.
中文: 举例来说，甲烷浓度波动的周期为2万2000年，与称为「岁差」的轨道周期相同。
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英文: For those who haven't heard the word, precessionis when an object with a nonspherical shape wobbles around its rotation axis.
中文: 如果你还不了解“进动”这个词，进动指的是物体绕它的旋转轴有非球形的摆动。
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英文: High-frequency ones can get hit too, but interactions with the solid crust of the neutron star stop the resulting precession much more quickly than for low-frequency ones.
中文: 高频率的进动也可能由撞击产生，不过中子星坚硬的外壳将使这种高频进动很快就停下来。
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英文: If, while exposed to the magnetic field, the precessing nuclei are also hit with a radiofrequency (rf) pulse, they will absorb and re-emit energy at specific frequencies according to their rate of precession.
中文: 当暴露在外界磁场中的时候，旋进的原子核也会被射频脉冲击中，它们会吸收并且根据旋进率再释放特殊频率的能量。
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英文: It goes backward, and is therefore called a precession.
中文: 它有前向后推，因此称做一个岁差。
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