以镒称铢 to weigh zhu with yi
Explanation
用较大的重量单位镒去衡量较小的重量单位铢，比喻一方力量强大，另一方力量微弱，不堪一击。
Using the larger unit of weight, Yi, to measure the smaller unit of weight, Zhu, it means one side's strength is strong, while the other side is weak and unable to fight.
Origin Story
春秋时期，吴王阖闾派伍子胥攻打楚国。伍子胥率领吴军势如破竹，一路高歌猛进，直逼楚国都城。楚王听闻吴军来势汹汹，吓得魂飞魄散，连忙调集兵马抵抗。然而，楚军的数量和战斗力远不及吴军，双方一交战，楚军便溃不成军，损失惨重。吴王阖闾见状，不禁感叹道：“楚军不堪一击，真可谓‘以镒称铢’啊！”这个故事后来演变为成语“以镒称铢”，用来形容一方实力远超另一方，如同用镒来称量铢一样，轻而易举地就能战胜对方。
During the Spring and Autumn Period, King Helü of Wu sent Wu Zixu to attack the state of Chu. Wu Zixu led the Wu army, advancing swiftly and approaching the capital of Chu. King Chu was terrified when he heard about the Wu army's fierce advance, so he quickly gathered his troops to resist. However, the number and combat capability of Chu’s army were far inferior to that of Wu’s army. Once the battle began, the Chu army collapsed and suffered heavy losses. King Helü of Wu sighed, saying, “The Chu army is incapable of resisting. It's truly ‘measuring Zhu with Yi!’” This story later became the idiom “Yì Yì Chēng Zhū”, used to describe one party's overwhelming superiority over another, as if using Yi to weigh Zhu, easily overcoming the opponent.
Usage
多用于书面语，比喻一方实力远超另一方。
Mostly used in written language; it is used as a metaphor to describe one side's strength far surpassing another.
Examples
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国家实力如此强大，岂能以镒称铢？
guojia shili ruci qiangda,qi neng yi yi cheng zhu?
How can the national strength be compared to such a small weight?
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敌方兵力远不如我，简直是以铢称镒！
difang bingli yuan buru wo,jianzhi shi yi zhu cheng yi
The enemy forces are far inferior to ours, it is simply like comparing a small weight to a large one!