We were talking about economics and you jump in and went on about making models, it is completely unrelated.
Examples (Wiktionary)
Mandarin
我那时并不知道这所谓猹的是怎么一件东西——便是现在也不知道——只是无端地觉得状如小狗而很凶猛。
我那時並不知道這所謂猹的是怎麼一件東西——便是現在也不知道——只是無端地覺得狀如小狗而很兇猛。
wǒ nà shí bìng bù zhī dào zhè suǒ wèi chá de shì zěn me yī jiàn dōng xī — biàn shì xiàn zài yě bù zhī dào — zhǐ shì wú duān dì jué de zhuàng rú xiǎo gǒu ér hěn xiōng měng .
Back then I did not know what this so-called cha was—which I still do not know even now—but just thought that it had a shape like a little dog and was somehow ferocious for no reason.
Mandarin
况且始终微笑著的和蔼的刘和珍君,更何至于无端在府门前喋血呢?
況且始終微笑著的和藹的劉和珍君,更何至於無端在府門前喋血呢?
kuàng qiě shǐ zhōng wēi xiào zhe de hé ǎi de liú hé zhēn jūn , gèng hé zhì yú wú duān zài fǔ mén qián dié xuè ne ?
Besides, how could Miss Liu Hezhen, who is amiable and always smiling, have been slaughtered for no reason in front of Government House?