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1·Lenticular clouds (via wired.

荚状云 (via wired.com)

2·Sometimes likened to UFOs, lenticular clouds are usually created by gravity waves.

透镜状云彩很像UFO，它通常由引力波造成。

3·Moist air forced to flow upward around mountain tops can create lenticular clouds.

这些透镜状云是山顶周围上升的潮湿空气形成的。

4·Bright colours (or irisation) are sometimes seen along the edge of lenticular clouds...

你往往能在这类云朵的边缘看到明亮的色彩(或虹彩效果)。

5·Lenticular clouds are often shaped like flying saucers, leading to people reporting UFO sightings.

透镜状云彩经常成飞盘状，人们有时会因此报告目击了U FO。