1. 身懷「蕨」技的郭城孟一開口，總能把一般人不甚熟悉的蕨類說得妙趣橫生。
   Versed in all things fern, Kuo Chen-meng always captures people’s imagination when he introduces them to these unfamiliar plants.

• versed in 在……方面有造詣；精通
  She is well versed in martial arts and dancing .

2. 有一回郭城孟在大英博物館工作時，一時興起把所有的金狗毛蕨屬的標本全部調出來端詳
   While studying in the British Museum, Kuo Chen-meng, on a whim, examined all of the Cibotium specimens held there.

• on a whim 心血來潮；突發奇想
  I decided to join the chess club on a whim.

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