This natural effect has inspired the "geoengineering" idea that humans could arrest the progress of global warming by pumping a bunch of sulfur dioxide into the atmosphere.
Risks include hypotension, respiratory arrest, toxic drug reaction, and rare neurologic complications. An epidural has no significant effect on the progress of labor.
危险包括低血压，呼吸停止，药物中毒反应，和罕见的神经系统并发症。硬膜外麻醉对产程进展没有明显影响。
3
Arresteffect of fly ash in ultra-high-volume on shrinkage of concrete at later age is more evident.