在牛津大学进行的进一步实验表明，乌鸦也会用棍子作为工具来检查各种物体，可能是评估它们是否构成危险。
Further experiments carried out at Oxford suggest that crows can also use sticks as tools to inspect all sorts of objects, possibly to assess whether or not they present a danger.
海蒂藏起脸来，而我一圈圈转着那只乌鸦，让它在挂着的那根绳子上舞动。
Hattie hid her face as I twirled the crow round and round, made it dance on its string.
猪花了很大的力气来抵制那只已被驯服的乌鸦摩西的谎言。
The pigs had an even harder struggle to counteract the lies put about by Moses, the tame raven.
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