speak for oneself 表明自己立场
let someone speak for oneself 让某人自己说话
speak for themselves 不言自明
speak for yourself 你自己说吧（常用于反驳）
actions speak for themselves 行动胜于言语
1. I don’t need to defend myself; my results speak for myself.
我不需要为自己辩护，结果会说明一切。
2. The data speak for themselves in this research project.
这些数据在该研究项目中不言自明。
3. You can speak for yourself instead of letting others explain.
你可以自己表达，而不是让别人替你说。
4. Let him speak for himself about what happened yesterday.
让他自己说明昨天发生了什么。
A: Do you think they did a good job?
A：你觉得他们做得好吗？
B: I think the results speak for themselves.
B：我觉得结果已经说明了一切。
1) 用于表示事实或结果本身已经足够说明问题
2) 指让某人自己表达观点或立场而不代为解释
3) 强调表现、成绩或证据具有自我证明能力
1. 不言自明；事实会说话
e.g.
The success of the project speaks for itself.
该项目的成功不言自明。
2. 自己为自己辩护或说明情况
e.g.
He should speak for himself instead of others explaining for him.
他应该自己说明情况，而不是别人代替他解释。
phrase
1. Used to indicate that the evidence or results are clear enough to explain something without further comment, or to allow someone to express their own views.
Synonym: be self-evident, be obvious