trace v. 找寻，追溯 n. 痕迹
brace v. 绷紧，振作起来 n. 支架
brace up, be positive
打起精神，积极点
charbroil v. 碳烤
category n. 种类
categorize v. 把……分类
humorous conversation is the staple ingredient of comedy.
幽默的对话是喜剧的主要成分。
purpose
staple food , staple food 主食
straw, straw n. 稻草，吸管,无价值的东西
a straw hat 草帽，
strawberry 草莓
entertain, a regular pulse /heartbeat
有规律的脉搏，跳动
entertainer n. 艺人
account n. 账户，说明，描述，报道
account
catalyst 催化剂
his words are the catalyst of the fighting.
race n. 人种，竞赛，比赛
racial adj. 种族的，
racism n. 种族主义
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