observed
[əb'zɜ:vd]
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;
例句:
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Weather satellites have observed a ring of volcanic ash girdling the earth.
气象卫星观测到一个环绕地球的火山灰带。
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They observed the comet for 70 days before it faded from sight.
他们观察了这颗彗星70天，直至其慢慢从视线中消失。
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It is a clear category that has been observed.
来自SA
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Researchers observed one bird impale a rodent on a cactus.
研究人员观察到一只鸟把一只啮齿动物钉在一棵仙人掌上。
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That change of direction has not yet been observed.
来自BBC
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I do not know if that has been observed.
来自SA