Jumping spiders are the only animals which are known to use it, but a camera with a good lens demonstrates the same principle —

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问题 Jumping spiders are the only animals which are known to use it, but a camera with a good lens demonstrates the same principle — keeping a person’s face sharp in the foreground while blurring out the trees in the background.

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答案which——that

解析 限制性定语从句的先行词animals有the only作为前置定语时,关系代词只能使用that。
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