People often mistake some man-made objects such as a kite or a balloon for a UFO.
人们常常把一些人造的物体，诸如风筝、气球错认成飞碟。
An Afghan boy flies a kite among other kites and a camera equipped balloon (top) used by the U. S. military at a hilltop in Kabul October 15, 2010.
10月15日，阿富汗首都喀布尔。一名阿富汗男孩正在放飞风筝，旁边的天空中是驻扎在山顶的美军施放的装着摄像头的气球。
An Afghan boy flies a kite among other kites and a camera equipped balloon (top) used by the U. S. military at a hilltop in Kabul October 15, 2010.
10月15日，阿富汗首都喀布尔。一名阿富汗男孩正在放飞风筝，旁边的天空中是驻扎在山顶的美军施放的装着摄像头的气球。
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