这是一种Pan 的技术 + v5 a$ ]6 L4 i) t* d/ y, V6 {9 G( }) K; k6 F3 u5 @: p4 u- O5 s
The basic idea behind panning as a technique is that you pan your camera along in time with the moving subject and end up getting a relatively sharp subject but a blurred background., s+ W" l0 I4 N) }5 Q. r