on-the-spot investigation是什么意思

on-the-spot investigation是什么意思 on-the-spot是什么意思啊 on the spot jump on the spot 是什么意思? 最好有参考 alex on the spot歌词 in the spot 和 on the spot 的区别 用on the spot（立即）造句 investigation on computer application in the machine tool de spot是什么意思 on the spot和on the site 的区别 the thief was reported ---- by the policeman on the spot. He was not the only person on the spot