句中的ing部分做什么成分

看到读者文摘上的一句话：

Many USOs—unidentified swimming objects—may be mistaken sighting of seals, oarfish, even logs or rocks, LeBlond and Sibert explain.

请问此处的sighting of seals, oarfish, even logs or rocks 在句子做什么成分呢？谢谢。

sighting在此为名词。《韦氏高阶》对其有明确的释义和例句：

[count]

: an act of seeing something or someone that is rarely seen or difficult to see — often + of

There have been several sightings of whales swimming off the island.

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 2021-06-28 17:31

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