Younger Scout: How can I tell the difference between a mushroom and a toadstool（毒菌） ?Older Scout: Just eat one before you go to bed. If you wake up the next morning, it was a mushroom.

年少的童子军：我怎样才能把蘑菇和毒蕈区别开呢？年长的童子军：上床前吃一个。如果你第二天早上醒来，那就是蘑菇。

tell the difference between 区分,区别,找出差异

mushroom n.蘑菇