I beg to differ
US /aɪ bɛɡ tə ˈdɪfər/
UK /aɪ bɛɡ tə ˈdɪfər/

1.
恕我不敢苟同, 我不同意
a polite way of saying that you do not agree with someone
:
•
You say it's a good idea, but I beg to differ.
你说这是个好主意,但恕我不敢苟同。
•
He claimed the report was accurate, but I beg to differ.
他声称报告是准确的,但恕我不敢苟同。