如果它像鸭子一样走路，像鸭子一样呱呱叫，那它一定是一只鸭子。
If it walks like a duck and quacks like a duck, it must be a duck.
“如果它长得像鸭子，而且像鸭子般呱呱叫，那我们至少得考虑这种可能性：我们手中得有只鸭科的小水鸟”，洛兹引述道格拉斯·亚当斯的话说。
"If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family Anatidae on our hands," said Rose, quoting Douglas Adams.
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