don't say;no comment ;
例句:
She stopped in mid-sentence.
话说了半句她就停下不说了。
"Shall we stop talking about her?"— 'If you like.'
“我们不说她了好不好?”——“听你的。”
I don't want to labour the point but there it is.
我不想反复重申,但还是不得不说。