Stemming to reduce the search term to its word stem before the search is carried out (English only).
词根化将搜索词缩减成它的词根，然后再进行搜索(只针对英语)。
Searching for the stemmed form of a term causes the term to be reduced to its word stem prior to the search.
搜索单词的词根形式将搜索词缩减成它的词根，然后再进行搜索。
So it is necessary to search and research a better source for stem cells.
所以，有必要研究及寻求更好的干细胞来源。
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