happen vi.发生;碰巧,恰好
sudden a.突然的,意外的
suddenly ad.突然地
相关单词
accident n.以外的事;事故
cad,cid,cas=to fall
accidental a.偶然发生的,意外的
casual a.偶然的;随便的
occasion n.场合,时刻;时机
occasional a.间或发生的,偶尔的
occasionally ad.偶尔地
incident n.发生的事;事件
相关单词
case n.情况,状况;事实;实例;案例,病例;盒子,箱子
形近单词
staircase n.楼梯
相关单词
stair n.楼梯
downstairs ad.在楼下 a.楼下的
upstairs ad.在楼上 a.楼上的
up-=up,aloft
up ad.向上;起床,起来;变大(高,多...);...完,...光;封闭
prep.向(高处);向...的上游
upright a.竖直的,直立的 ad.竖立着 n.柱子,直立的支撑物
upward a.向上的,上升的 ad.向上,上升
-ward形容(副)词词尾,表示方向
upwards ad.向上;向上游;在上部
forward vt.促进;转交 a.向前的,进步的 ad.进步
inward a.里面的 ad.向内
toward prep.向,对于;接近
downward ad.向下地 a.向下的
afterward ad.后来,以后
backward a.向后的,倒行的;落后的;迟钝的 ad.向后,朝相反方向
形近单词
award n.奖,奖品 v.授予,奖给
reward n.报答,报偿;报酬,酬金 vt.报
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