這是因爲這個‘塊’字在四川分類上是個例外。它把北平的去聲字歸入上聲，所以改錯了。
这是因为这个‘块’字在四川分类上是个例外。它把北平的去声字归入上声，所以改错了。
zhè shì yīn wèi zhè ge ‘ kuài ’ zì zài sì chuān fēn lèi shàng shì ge lì wài ． tā bǎ běi píng de qù shēng zì guī rù shǎng shēng ， suǒ yǐ gǎi cuò le ． This is because kuai 塊／块 (kuài) is an anomaly in terms of its Sichuan[ese] [tonal] category. He treated a Beijing tone 4 character as tone 3, and thus made an improper correction.
Examples (Wiktionary)
Mandarin
这是因为这个‘块’字在四川分类上是个例外。它把北平的去声字归入上声，所以改错了。
這是因爲這個‘塊’字在四川分類上是個例外。它把北平的去聲字歸入上聲，所以改錯了。
zhè shì yīn wèi zhè ge ‘ kuài ’ zì zài sì chuān fēn lèi shàng shì ge lì wài ． tā bǎ běi píng de qù shēng zì guī rù shǎng shēng ， suǒ yǐ gǎi cuò le ．
This is because kuai 塊／块 (kuài) is an anomaly in terms of its Sichuan[ese] [tonal] category. He treated a Beijing tone 4 character as tone 3, and thus made an improper correction.