281. stimulus n. 刺激
282. straightforward a. 坦率的 a ~ reply
283. stubborn a. 倔强的
284. stumble v. 绊倒
285. subordinate a. 从属的
286. subscribe to v. 订阅
287. subsidy n. 补贴
288. subtle a. 微妙的 the ~ difference of the twowords
289. supervise v. 监督
290. suppress v. 镇压; 抑制
291. tangle with v. 争吵, 纠葛
292. tariff n. 关税
293. tease v. 取笑
294. temperament n. 气质
295. tempt v. 引诱
296. tentative a. 试探的
297. terminate v. 终止
298. texture n. 质地
299. threshold n. 开端 on the ~ of
300. timid a. 胆小的