defocusing的意思？

defocusing的音标：defocusing的英式发音音标为：[dɪ'fəʊkəsɪŋ]defocusing的美式发音音标为：[dɪ'foʊkəsɪŋ]...

Self - focusing and self - defocusing intensity dependence of the index of the nonlinear medium.根据非线性折射率系数的符号,克尔介质分为自聚焦介质和自散焦介质两类....