a lack of prespecification什么意思

a lack of prespecification什么意思 lack of fit prob 什么意思 lack是a lack of还是lack of 可数么? lack ,lack in ,lack of有什么区别 lack的用法请问a lack of、be lacking in和lack for用法上有什么区别? lack 的用法a lack of、be lacking in和lack for用法上有什么区别吗?尤其是lack of Lack the tune of lyrics,ultimately not perfect什么意思 Serious lack of oxygen in the cabbages什么意思 英语中Lack的用法请问lack,a lack of,be lacking in这3个词有什么区别.我知道lack可以做 lack of 和 a lack of的区别 lack of和a lack of的区别? 【跪求】lack of 和 a lack of的用法,