He then asked each volunteer to decapitate a white rat.

然后他让每个志愿者砍掉一只小白鼠的头。

I was known to collect moths and butterflies and to get into no worse mischief than hiding now and again an old tailless white rat in my coat-pocket or my desk.

大家知道我喜欢收集飞蛾和蝴蝶，最调皮的事情也不过是偶尔把一只没尾巴的老鼠藏进口袋或是课桌里。