(be)on guard站岗
348．guard against (=defend，keep safe) 警惕,防止guard……against警卫……防止
349．guess at猜，估计
350．by guess靠猜
351．be guilty of犯有……罪或过失
352．be in the habit of习惯于
353．break off (a habit)改掉（某种习惯）
354．break sb. of (a habit)使某人改掉（某习惯）
355．get (fall) into the habit of养成了……的习惯
356．come to a halt (=stop) 停止；停住
357．at hand在手边，眼前（附近）
358．by hand用手工（做）
359．hand in glove (with)狼狈为奸，密切合作
360．in hand 1）在手边2)(=under control)控制住
361．in the hands of由……掌握，控制，负责
362．live from hand to mouth勉强度日，现挣现吃
363．at the head of在……的前头
364．head for (=move towards)向……方向前进
365．hear of (=know about)听人说起，听说过
366．at heart (=in reality)内心里，实际上
367．in one's heart (of hearts)内心深处，事实上
368．by heart (=by memory)熟记，背（诵）
369．to one's heart's content尽情地
370．with all one's heart全心全意地，真心实意
371．hinder……form (=stop……from)阻碍，使……不能做
372．be (go) on holiday在（去）度假
373．be (feel) at home (=to be comfortable; not feel worried)感觉合适，无拘束，熟悉
374．be honest in诚实