I rest my case idiom
（用于表示相信刚发生的事情或表明你说的是真话）还用我多说吗？
said when you believe that something that has just happened or been said proves that you are right or telling the truth
When told of Smith's angry response to her claim, she said simply, "I rest my case." (= his response proves that what I say is true) 当被告知史密斯对她的说法的恼怒反应时，她只是说：“还用我多说吗？”
law specialized (also my/the case rests)（律师出庭用语）陈述完毕。
said by lawyers in a law court when they have finished the explanation of their case