Or, as the Russians would say, a white crow.

或者，像俄罗斯人说的：「像一只白乌鸦」。

Both for a philosopher and for a scientist it can be important not to reject the possibility of finding a white crow.

对于哲学家和科学家来说，不拒绝寻找白乌鸦的可能性是很重要的。