Every once in a while he disappears for days on end.他偶尔会一连几天不见踪影。Every time Tom visits me, one of my ashtrays disappears. I'm beginning to smell a rat.汤姆每来我这儿一次，我就丢一个烟缸，于是我开始起疑了。Under the pretence of lighting a candle, she evades him and disappears.她假装点蜡烛，避开他消失了。