UFO sightings have been reported throughout recorded history and in various parts of the world, raising questions about life on other planets and whether extraterrestrials have visited Earth.
在全世界各地不同时期都有ufo目击的报告，引起人们关于外星生命以及地外生命是否访问过地球的争论。
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The incident was widely reported on television and the Internet. But later questions about whether the incident could be a hoax began appearing on some Web sites.
电视和互联网上广泛报道了这一事件。但后来对这一事件是否可能是一个骗局的质疑开始出现在一些网站上。
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Residents were reported to have raised questions about the smelter in July after their children began falling ill and refusing to eat.