lag (also time-lag)

n period of time separating two events, esp an action and its effect; delay （两事件之间的）时间间隔; （尤指行动与效果之间的）时间差, 迟缓, 延搁: a lag of several seconds between the lightning and the thunder 闪电与打雷先後相差的几秒钟.

lacuna, lacy, lad, ladder, laddie, laden, Ladies, ladle, lady, lady bird, Lady Chapel, Lady Day, lady killer, lady's man (also ladies man), lady-in-waiting, lady-killer, ladybird, ladylike, ladyship (also Ladyship), lag, lager, laggard, lagging, lagoon, lah (also la), laid, laid-back, lain, lair, laird, laisser-faire (also laissez-faire), laity, lake, Lake Poets, lakh, lam, lama, lamasery, lamb, lamb's-wool,