15.Stage 阶段，时期 phase, at the early stage of development

　　n. 舞台，戏剧platform

　　v. 把 搬上舞台 筹划，举行，发动

　　例句7.Our school stages a play every year.

　　例句8.Who staged a coup against the Shah in 1963.

　　16.Stagger v. 蹒跚，摇晃,

　　例句9.The blow staggered him for a moment.

　　²错开(座位)

　　例句10.Our management has decided to stagger our working hours .

　　²Stutter, stammer 口吃

　　²Stammer stumble摔倒，结巴

　　17.Stagnant a. 停滞的，迟钝的

　　例句11.The balance sheet clearly shows that the company has a stagnant economy.资产负债表清楚地表明公司的经营情况不景气。

　　例句12.Japan's economy has been stagnant for more than a decade.

　　18.stain n. 污点，瑕庇；v. 着色，染色,弄污

　　²soil, dirty,

　　例句13.I have stained my fingers with ink.

　　George has a big coffee ____ on the front of his jacket.

　　A. spot B. mark C. stain D patch

　　Stainless 无污点的 ， 不锈的

　　stainless steel

　　19.stale 陈旧的，陈腐的

　　例句14.Inside the apartment was an unpleasant smell of __ air.

　　20.stall n. 货摊