Delayed choice experiment raised by J. A. Wheeler was extended from quantum double slit experiment, and it concludes that: our present behavior can affect the past.

惠勒提出的延迟选择实验是量子双缝实验的一个扩展，它给出了一个特殊的结论：我们现在的行为对过去产生了影响。

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Conclusions For pregnant women whose renal colic cannot be alleviated by conservative methods, placing double-J-catheter is a safe and effective treatment choice.

结论对于保守治疗不能缓解的输尿管结石并发肾绞痛孕妇，置入输尿管双J管是一种安全有效的治疗方法。

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