risk vt. 冒……的危险n. 冒险，风险

　　例句：All the people who know this secret represent a security risk.

　　凡是知道这个秘密的人都对安全造成风险。

　　hazard n. 冒险，危险，冒险的事vt. 冒……的危险，赌运气

　　例句：The car had its hazard warning lights on.

　　这辆汽车亮起了危险信号灯。

　　Martin hazarded all his money in theattempt to save the business.

　　马丁为挽救这家企业，不惜冒险投入他的全部金钱。

　　brisk adj. 敏锐的，轻快的，兴隆的

　　例句：Business is always brisk before Christmas.

　　圣诞节前生意总是很兴隆。

　　crisp adj. 脆的，易碎的

　　例句：The celery is fresh and crisp.

　　这芹菜新鲜脆嫩。

　　brick n. 砖，砖块，砖形物(如茶砖，冰砖等)

　　例句：The house is fronted with brick.

　　这栋房子用砖做墙面。