通常，得出的新单词与原来的单词在意思上相关涉。
Often, the resulting new word will carry a meaning related to the original word.
对于所针对的单词，index- of返回单词在原来序列中的位置。
Given that word, index-of returns its position in the original sequence.
对于所针对的单词，index- of返回单词在原来序列中的位置。
Given that word, index-of returns its position in the original sequence.
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