serious/seriously/seriousness
serious/ˈsiəriəs/adj.1.严肃的；庄重的：He looked very serious.他看上去十分严肃。2.严重的：a serious accident严重的事故；a serious problem严重的问题3.认真的：a serious worker工作···
sermon
sermon/ˈsə:mən/n.［c］训诫，说教，布道：The minister preaches a sermon now and then.牧师不时地讲道。Don't preach me a sermon, please.请不要对我讲大道理。She preached a sermo···
servant/serve/service
servant/ˈsə:vənt/n.［c］仆人；用人：hire (dismiss) a servant雇用(解雇)仆人；a public(government) servant公仆（政府公务员）The master left his money with a trusty servant.主人把他···
session
session/ˈseʃən/n.［c］1.会议，一届会期(通常指正式的会议)：a special session特别会议；the first session of the U.N. General Assembly联合国大会的第一次会议2. (从事某项活动)集会(或···
set
set/set/ I.vt.&vi.1.放，竖立：Please set the ladder against the wall.请把梯子靠在墙上。Who has set the flower in the vase?谁把花插在花瓶里的? 2.安置，安排：Set the table for di···
setback
setback/ˈsetbæk/n.［c］挫折；失败；倒退；（疾病）复发: meet with many setbacks遇到许多挫折；suffer a setback遭受挫折；a temporary setback in sb’s fortunes某人一时走败运［考句］A···
setting
setting/ˈsetiŋ/n.［c］1.环境，背景：a beautiful setting for a picnic优美的野餐地点2.可调点：The machine has two settings, fast and slow.这种机器有快、慢两挡可调。［辨析］与circum···
settle/settlement
settle/ˈsetl/vt.&vi.1.解决，安排：settle a problem解决问题They settled their quarrel in a friendly way.他们友好地解决了争吵。2.支付，结算：settle (up) an account结账3.安排，安···
seven/seventeen/seventeenth/seventh
seven/ˈsevn/num.七，七个(人或物)；七岁：There are seven continents in the world.世界上有七大洲。Two sevens are fourteen.二七一十四。My son will be seven this year.我儿子今年就7岁了···
seventy/seventieth
seventy/ˈsevnti/ I.num.七十，七十个(人或物)：About seventy people attended.大约70人出席。My teacher is a seventy-year-old woman.我的老师是一位70岁的老妇人。‖II.n.1.(pl.)年代：in ···
