If it's not a potluck, where everyone brings a dish, the host will possibly answer, "No, just yourself."
如果不是每人带一道菜的聚餐,主人很可能会回答:“不用,人来了就行。”
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So can the movement of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.