crop circle
noun
- an area of standing crops which has been flattened in the form of a circle or more complex pattern. No general cause of crop circles has been identified although various natural and unorthodox explanations have been put forward; many are known to have been hoaxes.庄稼怪圈（倒伏的作物形成的圆圈或其他更复杂的形状, 尽管人们对此作出了种种自然的、不正统的解释, 其中有许多已知是骗局, 但产生这种庄稼怪圈的原因还未被最终发现）。