After he switched schools, his academic performance improved very quickly.
Examples (Wiktionary)
Mandarin
社会主义制度促进了我国生产力的突飞猛进的发展,这一点,甚至连国外的敌人也不能不承认了。
社會主義制度促進了我國生產力的突飛猛進的發展,這一點,甚至連國外的敵人也不能不承認了。
shè huì zhǔ yì zhì dù cù jìn le wǒ guó shēng chǎn lì de tū fēi měng jìn de fā zhǎn , zhè yī diǎn , shèn zhì lián guó wài de dí rén yě bù néng bù chéng rèn le .
The socialist system has promoted the rapid development of the productive forces of our country, a fact even our enemies abroad have had to acknowledge.