desire ,desirable,desired,are()A,roots B,stems C,free roots D,root as well as stems为什么呢?D的意思是“词根和词干一样”吗?desirable不是词根,

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desire ,desirable,desired,are()
A,roots B,stems C,free roots D,root as well as stems
为什么呢?
D的意思是“词根和词干一样”吗?
desirable不是词根,

意思是这三个词有相同的词根和词干
as well as是不但..而且 的意思
root就是the basic part of a word比如coldness词根是cold
stem就是the part of a word that stays the same when different endings added to it比如dri-是driver driving的词干