Note that the total timestamp contribution score of all evidence sentences d∈C W eb (t 1 ,t 2 ) T d (s 0 ) can be considered as the "weighted size" of C W eb (t 1 , t 2 ), i.e., we weigh each evidence sentence using Equation (1) and sum all these weights.
if we use only the "weighted size" of C W eb (t 1 , t 2 ) for the time-aware score Score T ime LSP (t 1 , t 2 ), there will be some issues.