问题标题：
帮忙看一下这句话里的that(已用【】标出）指什么,是什么成分?Thepossibilitythatmassextinctionsmayrecurperiodicallyhasgivenrisetosuchhypothesesas【that】ofacompanionstarwithalong-periodorbitdeflectingoth
问题描述：
帮忙看一下这句话里的that(已用【】标出）指什么,是什么成分?
Thepossibilitythatmassextinctionsmayrecurperiodicallyhasgivenrisetosuchhypothesesas【that】ofacompanionstarwithalong-periodorbitdeflectingotherbodiesfromtheirnormalorbits,makingsomeofthemfalltoearthasmeterorsandcausingwidespreaddevastationuponimpact.
蔡宣三回答：
感觉可能是指hypotheses,在进一步解释suchhypotheses是怎样的
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