1. Some viewers wondered if they were scraps of paper or plastic caught in updrafts from the spotlights’ heat. 有些人以为这些物体可能是聚光灯发光时产生的热量捕捉到的漂浮在高空的纸片或塑料碎片。
2. These downdrafts hit the surface of the planet, flow outward, and collide with each other, forming updrafts. 气流向下落在地球表面，向外流动，相互碰撞，如此一来就形成上升气流。
3. But without a raptor's sharply honed sense for the gravity-defying updrafts, humans are beholden to chance. 但是如果没有猛禽们对克服重力的上升气流敏锐的判断力，人们常常错失良机。
4. Some viewers wondered if they were scraps of paper or plastic caught in updrafts from the spotlights' heat. 一些目击者认为这也许是聚光灯中心处漂浮的纸屑和塑料碎片。
5. Tornadoes form when the updrafts of air that supply storms with warm humid air become a vortex or high-speed whirlwind. 当上升气流与能形成风暴的湿热空气变成高死锬旋风时，就形成了龙卷风。
