thousand articles, same rule (idiom); stereotyped and repetitive
once you've seen one, you've seen them all
Definitions (粵典–words.hk)
語句
形式或者內容冇變，死板、公式化 hackneyed; trite
His articles are all hackneyed and without anything new.
His articles are all hackneyed and without anything new.
yue:His articles are all hackneyed and without anything new. 佢啲文章千篇一律，冇啲新意。
反義詞
變化多端
Definitions (Wiktionary)
phrase, idiomatic
all of the same pattern; stereotyped
Definitions (Kaifangcidian)
（沒有對應漢語詞彙）
Examples (Tatoeba—Mandarin-English)
Mandarin
这个节目变得千篇一律。
這個節目變得千篇一律。
zhè ge jié mù biàn de qiān piān yī lǜ 。
This program has become stereotyped.
Examples (粵典–words.hk)
Cantonese
千篇一律
千篇一律
cin1 pin1 jat1 leot6
hackneyed; trite
Examples (Wiktionary)
Mandarin
教条主义者不遵守这个原则，他们不了解诸种革命情况的区别，因而也不了解应当用不同的方法去解决不同的矛盾，而只是千篇一律地使用一种自以为不可改变的公式到处硬套，这就只能使革命遭受挫折，或者将本来做得好的事情弄得很坏。
教條主義者不遵守這個原則，他們不瞭解諸種革命情況的區別，因而也不瞭解應當用不同的方法去解決不同的矛盾，而只是千篇一律地使用一種自以為不可改變的公式到處硬套，這就只能使革命遭受挫折，或者將本來做得好的事情弄得很壞。
jiào tiáo zhǔ yì zhě bù zūn shǒu zhè ge yuán zé ， tā men bù liǎo jiě zhū zhǒng gé mìng qíng kuàng de qū bié ， yī né r5 yě bù liǎo jiě yīng dāng yòng bù tóng de fāng fǎ qù jiě jué bù tóng de máo dùn ， ér zhǐ shì qiān piān yī lǜ de shǐ yòng yī zhǒng zì yǐ wéi bù kě gǎi biàn de gōng shì dào chù yìng tào ， zhè jiù zhǐ néng shǐ gé mìng zāo shòu cuò zhé ， huò zhě jiāng běn lái zuò de hǎo de shì qing nòng de hěn huài ．
The dogmatists do not observe this principle; they do not understand that conditions differ in different kinds of revolution and so do not understand that different methods should be used to resolve different contradictions; on the contrary, they invariably adopt what they imagine to be an unalterable formula and arbitrarily apply it everywhere, which only causes setbacks to the revolution or makes a sorry mess of what was originally well done.