“retract”的概念、定义、翻译、参考文献-科学参考

单词	retract
释义	retract [`rē´trakt] ^MATHEMATICS A subset R of a topological space X is a retract of X if there is a continuous map f from X to R, with f (r ) = r for all points r of R.
随便看	necrotize necrozoospermia nectar nectarine nectary nectocalyx Nectonematoidea nectophore nectosome Nectridea Nectrioidaceae need need complementarity needle needlebar needle beam needle bearing needle blow needle board needle coal needle dam needle file needle gap needle ice needle nozzle

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