正弦波检查法因条件所限，无正弦波发生器或频率不准，不易实现。
The sine wave inspection method is limited by condition, does not have the sine-wave-generator or the frequency is not precise, is not easy to realize.
受热的离子振动频率细小的差别，使得时钟有点不准确。
The heated ion vibrates at a slightly different frequency, making the clock a little less accurate.
然而，造成测量还有些不准确的来源在于原子在它自己周围的微动，以至在朝着光束和离开光束移动时，使光束的频率稍有所变化。
However, a source of inaccuracy comes from the fact that the atoms jiggle around, so that those moving toward and away from the beam experience slightly different frequencies.
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