observed [əb'zɜ:vd]

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附加级

v.观察，研究( observe的过去式和过去分词 )；遵守；（尤指为科学目的的）观察；看到

Have you observed any changes lately? 最近你注意到什么变化没有？
This behaviour is commonly observed among several species of finch. 这种行为常常可以在几种雀科鸣禽中看到。来自《简明英汉词典》