C 2 s: t, E3 S- P+ l) b7 w% Qto always kow about the most recent changes or developments in a particular situation or activity.# \" j# ]5 }% S% W/ g4 n. r% r
e.g. 9 l& r7 T& P8 [+ u; a) Z' }" {people with their finger on the pulse of fashion and pop culture.