Dropping back may be unsuitable for people with back problems, because there is little support from the hands in this version.
背部有问题的人做向后的体式可能会感到不适，因为在变换当中没有手的支撑。
For example, uranium surged to a high last year before dropping back to just over half its peak.
例如，铀价去年飙升至高点，然后回落至略高于峰值水平的一半。
A Loss Estimation for Dropping-back Atom Number in the Atomic Fountain
原子喷泉中回落信号原子数损失的估计
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