lack,shortage,absence的区别

in the lack of in shortage of的区别 lack与absence用法区别 lack of 和in the shortage of 有什么区别 lack of 和lack for 的区别? absence与absent的意思与区别? absence minded 和 absent minded 的区别 lack of 和 a lack of的区别 lack of和a lack of的区别? lack sth 与lack for sth 的区别 lack of sth 和 a lack of 的区别 写一段简单的英语对话1.lack of sleep and rest2.a shortage of teachers i lack,lack in,lack for 的用法区别,三个都是动词,