not to say什么意思解释？

I found the characters very two-dimensional, not to say dull.我觉得那些人物形象即使不说是乏味无聊，至少也是毫无深度。She warned me not to say anything to upset him.她警告我不要说任何让他不高兴的话。He made up his mind not to say a word.他打定主意一句话也不说....

not to say的音标：not to say的英式发音音标为：[nɔt tu: sei]not to say的美式发音音标为：[nɑt tu se]...