With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: IPhone 3G includes tri-band UMTS/HSDPA.
text_B: Vatica scortechinii is a species of plant in the family Dipterocarpaceae .. Dipterocarpaceae. Dipterocarpaceae. Vatica. Vatica. plant. plant. It is a tree endemic to Peninsular Malaysia .. endemic. endemism. Peninsular Malaysia. Peninsular Malaysia. It is a critically endangered species threatened by habitat loss .. critically endangered. critically endangered. habitat loss. habitat loss
not_related.