十個特別的wh字(5):therein

 in or into a particular place, thing,
在那裡；在其中；在那點上

例: The learning and teaching resources covering different Key Learning Areas (KLAs)/subjects at various stages of learning are provided on the EDB One-stop Portal. We will continue
 to enrich and update the resources therein to enable teachers to obtain relevant materials to facilitate learning and teaching.