Dr Cappuccino and Dr Arnason suspected this might be because native predators are sometimes "pre-adapted" to the aliens' defences, but in other cases they are not.
卡普奇诺和阿纳森猜测，这可能是因为土生土长的掠食者对外来物种所具有的防御机制有时产生“预适应”，有时又不产生。
Dr Cappuccino and Dr Arnason suspected this might be because native predators are sometimes "pre-adapted" to the aliens' defences, but in other cases they are not.
卡普奇诺和阿纳森猜测，这可能是因为土生土长的掠食者对外来物种所具有的防御机制有时产生“预适应”，有时又不产生。
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