这项制度之所以难以推行,乃因地方执行标准长期不统一。Zhè xiàng zhìdù zhī suǒyǐ nányǐ tuīxíng, nǎi yīn dìfāng zhíxíng biāozhǔn chángqī bù tǒngyī.The system is difficult to implement because local enforcement standards have long been inconsistent.
他之所以成功,乃是因为从不放弃。Tā zhī suǒyǐ chénggōng, nǎi shì yīnwèi cóng bú fàngqì.The reason he succeeded is that he never gave up.
此乃我们祖辈留下的老房子,请大家爱惜。Cǐ nǎi wǒmen zǔbèi liú xià de lǎo fángzi, qǐng dàjiā àixī.This is the old house left by our ancestors; please take care of it.