at the present stage在现阶段　　at the weekend周末　　at all times永远　　at 405 Victory Roa

    at a loss不知怎办　　at any rate不管怎样　　at length详细地　　be at high tide处于高潮期　　at our i

　  at minus ten degrees centigrade　　摄氏零下10度　　Water freezes at 0°centigrade.　　水在镊

    The soldier of the Eighth Route Army rode 100 li on a horse a day in order t

    He came here on purpose to discuss it with you.　　他到这来是要与你讨论这件事的。　　This lunch

    on the go活跃，忙碌，on the lookout注意，警戒，on the watch监视着，on the hop趁不备抓住某人等等。　　on

   horse 马　　mare 母马　　colt，foal 马驹，小马　　pony 矮马　　thoroughbred 纯种马　　mustang 野马　　mul

   tragedy 悲剧　　one-act play 独幕剧　　opera 歌剧　　farce 滑稽戏，趣剧　　(stage)play 话剧　　Beijing

    to do some shopping;to go shopping 买东西　　shopping centre 商业中心区　　department st

　  long for渴望　　look after目送;照料，照顾　　look at看着;看待　　look back回头看;回顾　　look down on/u