上下或左右摇晃, 振动

to ignite, to light a fire, to agitate, to start an engine, ignition, fig. to stir up trouble

把原来的方向、位置或次序反过来

click-through rate (CTR) (Internet)

forefront, front/first line

quintessence, nonpareil, example, specimen, nonsuch, apotheosis, ideal, nonesuch, prototype, monument, paragon, role model, soul, saint, model