Words that rarely turn up in books often get omitted from dictionaries, including slenthum (an Indonesian musical instrument) and, ironically, deletable.

在书中鲜有出现的单词往往被词典所忽略，这其中就包括slenthum(一种印度尼西亚乐器)，还有令人讽刺的deletable(可以删除的，可以省略的，译者注)。