恰如其分 just right
Explanation
恰如其分的意思是：事情做得恰到好处，正合分寸。形容处理事情或说话非常恰当，不超过分寸。
The meaning of "恰如其分 (qià rú qí fèn)" is: things are done just right, exactly the right measure. It describes the handling of things or speaking as very appropriate and moderate.
Origin Story
话说唐朝时期，有个叫李白的诗人，他写诗才华横溢，但他为人洒脱不羁，常有得罪权贵的时候。一次，他受邀参加朝廷宴会，皇上命他赋诗一首。李白思忖片刻，便提笔写下一首短诗，字里行间既表达了对皇上的敬意，又不失自己的个性。诗作完成后，满朝文武都赞叹不已，认为这首诗恰如其分地表达了对皇上的敬意，又不失诗人本色。李白自己也甚为满意，深感自己处理得当，既表达了自己的想法，也没有逾越礼仪。这便是“恰如其分”的最佳体现。从此，“恰如其分”便成为人们形容为人处世、说话做事要恰到好处的典范。
In the Tang Dynasty, there was a poet named Li Bai, who was extremely talented but also unrestrained and often offended powerful people. Once, he was invited to a court banquet, and the emperor ordered him to write a poem. After a moment's thought, Li Bai wrote a short poem. It showed his respect for the emperor while also remaining true to his own personality. After finishing the poem, all the officials and generals praised it. They believed it perfectly expressed the respect for the emperor without losing the poet's unique style. Li Bai himself was also very satisfied and felt that he had handled it appropriately. He had expressed his ideas without overstepping the bounds of etiquette. This was the perfect example of "just right". Since then, "just right" has become a model for how people should behave, speak, and act appropriately.
Usage
形容说话做事恰到好处，不超过分寸。
It describes speaking and acting in exactly the right measure, without exceeding the limits.
Examples
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他的发言恰如其分，既表达了观点，又避免了冒犯。
tā de fāyán qiàrúrqífèn, jì biǎodále guāndiǎn, yòu bìmiǎnle màofàn
His speech was just right, expressing his views without being offensive.
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这份报告恰如其分地总结了项目进展，简洁明了。
zhè fèn bàogào qiàrúrqífèn de zǒngjié le xiàngmù jìnzǎn, jiǎnjié míngliǎo
The report summarizes the project's progress concisely and appropriately.
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老师的评价恰如其分，既肯定了学生的进步，也指出了不足。
lǎoshī de píngjià qiàrúrqífèn, jì kěndìng le xuésheng de jìnbù, yě zhǐchūle bùzú
The teacher's evaluation was just right, both affirming the students' progress and pointing out their shortcomings.