"This document is really work in progress and I am sure much remains to be improved."
Deficiency, a lack
insufficient too little 不可数 too few 可数lack not enough not sufficient/insufficient fail to meet the requirements be unqualified
there is not enough time. time is not enough.
not enoughtoo little
imperfect,sth to be perfected/improved,多了，还是要看具体的话
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2014兔兔
