什么看起来像一只鸭子未必庸医像鸭。

What looks like a duck may not quack like a duck.

youdao

如果它看起来像一只鸭子，走路像一只鸭子，嘎嘎叫像一只鸭子，它一定要是一只鸭子！

If it looks like a duck, walks like a duck, and quacks like a duck, it must be a duck!

youdao

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.

youdao