Examples
yú shì于是chū xiàn出现le了yí一gè个wèn tí问题，nǎ lǐ哪里néng能zhǎo找wǒ men我们xū yào需要de的jī qì机器。
于是出现了一个问题，哪里能找我们需要的机器。
Then arose the question of where we were to get the necessary machinery.
他觉得她说得很有道理，于是接受了她的建议。
He thought she spoke reasonably, so he accepted her suggestion.
于是我停止阅读。
So I stopped reading.