therein

The insurance covers the apartment and all the property therein.这个保险涵盖公寓以及其中的一切财产。

His name was mentioned in the article, although he was incorrectly described therein as a medical doctor.他的名字在文中被提及，虽然他被错误地描述成了一个内科医生。

They have to make a decision soon. Therein lies the problem. [=that is why there is a problem] If they act too quickly, they run the risk of choosing the wrong plan.他们得马上做出决定。这就是问题所在。如果他们行动过快，就有选择错误计划的风险。