uncommon;rare ;
They use a lot of big words.
他们使用很多生僻的词汇。
Some words are really too esoteric for this dictionary.
有些单词实在太生僻了,未收入本词典内.
Yi is more uncommon, Xi is a character, the need to be careful.
只是黟较为生僻, 歙是多音字, 需要小心.
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