herein
/ˌhɪərˈɪn/adverb
1- formal in this document or book〈正式〉在此（公文, 书）中。
1.1
- used to introduce something that depends on or arises from what has just been mentioned于此, 在此：
the statues are sensual to the point of erotic and herein lies their interest.
这些雕像性感到近乎色情, 它们引人注意之处就在于此。