"They provide a useful service," said Flack.

弗拉克说：“他们提供有用的服务。”

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"There are huge clusters of organic waste they can feed on," said Flack.

弗拉克说：“有大量的有机垃圾可以供它们食用。”

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"There are huge clusters of organic waste they can feed on," said Flack.

弗拉克说：“有大量的有机垃圾可以供它们食用。”

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