毋庸置疑 undoubtedly
Explanation
毋庸置疑的意思是不用怀疑，非常肯定。
Wú yōng zhì yí means there is no need to doubt, very certain.
Origin Story
著名科学家爱因斯坦，在科学研究中总是保持着严谨细致的态度。一次，他在研究一个复杂的物理问题时，经过反复的推导和计算，终于得出了一个结论。这个结论非常重要，关系到整个理论体系的完整性。然而，爱因斯坦并没有立刻宣布他的发现，而是反复检查每一个步骤，每一个公式，甚至每一个计算结果。他一遍遍地推敲，一遍遍地验证，直到确定没有任何错误之后，才将这个结论公布于众。爱因斯坦的这种严谨求实的科学精神，使他的研究成果具有极高的可信度，他的结论往往是毋庸置疑的。
The famous scientist Einstein always maintained a rigorous and meticulous attitude in scientific research. Once, while researching a complex physics problem, after repeated deductions and calculations, he finally came to a conclusion. This conclusion was very important and related to the integrity of the entire theoretical system. However, Einstein did not immediately announce his discovery, but repeatedly checked every step, every formula, and even every calculation result. He repeatedly pondered and verified until he was sure that there were no errors, before making this conclusion public. Einstein's rigorous and pragmatic scientific spirit made his research results highly credible, and his conclusions were often beyond doubt.
Usage
用于表示说话人对某件事情的肯定和确信。
Used to express the speaker's affirmation and certainty about something.
Examples
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他的说法毋庸置疑。
tā de shuōfǎ wú yōng zhì yí
His statement is beyond doubt.
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证据确凿，毋庸置疑。
zhèngjù quèzáomù yōng zhì yí
The evidence is conclusive; there is no doubt about it.