principal adj.主要的
同chief, foremost, prime, main, leading
The principal aim of this plan is to find a way to help students improve their study habits.
这项计划的主要目标是找出一种帮助学生改善读书习惯的方法。
quibble n.遁辞
同evasion, equivocation, sophism
David has a quibble with my idea of buying new computers for the office.对我提出为办公室购买新电脑一事，戴维避而不答。
rampant adj.蔓延的；猖獗的；猛烈的
同widespread, rife, uncontrollable, excessive
You cannot allow children to rampant through the museum.
你不能任由小孩子在博物馆里乱跑。
reluctant adj.不情愿的
同unwilling, loath, averse, hesitant
Bert was reluctant to tell his mother the washing machine was broken again.伯特不愿告诉母亲洗衣机又坏了。
retreat v.撤退
同withdraw, recede, draw back
The soldiers retreated back to their camp in the hills.
士兵们撤回到山上的营地中。
sanction n.①批准②制裁
同1.confirmation, permission 2.boycott, penalty
The city government gave its sanction to the library to build a new wing.市政府批准图书馆兴建新的分馆。
setback n.挫折；后退
同backslide, defeat
Our building plans suffered a setback when a strong typhoon destroyed our building site.
强劲的台风摧毁了工地，使我们兴建大楼的计划停滞。
smear v.涂脏；中伤
同stain, besmirch, smudge
The children playing outside had smeared mud all over their clothes, faces and hands.
孩子们在屋外玩耍，用泥巴把衣服、脸和手都弄得脏兮兮的。
spur v.刺激
同incite, arouse, instigate, stir up
Her coach‘s encouragement helped spur Heather to run faster and win the race.
教练的鼓励刺激了希瑟，使她跑得更快并赢得了比赛。
stringent adj.严厉的
同strict, exacting, severe, forceful, rigorous
The military is famous for its stringent regulations of dress and behavior.军队以其严格的着装要求和行为规范而著称。
www.59wj.comsurpass v.凌驾
同excel, outdo, exceed
Tommy studied so hard that he surpassed all the other students in his class.
汤米非常用功，因此成绩比班上的其他同学都好。
thrall n.奴隶
同slave, serf, bondsman
The peasant farmers were the thralls of the lord of the castle.
这些农夫是这个城堡的主人的奴隶。
timid adj.胆怯的
同fearful, cowardly, shy
The tiny kitten was very timid, and too afraid to approach us.
这只小猫非常胆小，不敢靠近我们。
unassuming adj.谦虚的
同modest, retiring, reversed, humble
Don‘t be fooled by his unassuming manner; he is really a very proud man.别被他谦虚的态度骗了，其实他是个很骄傲的人。
valiant adj.勇敢的
同dauntless, brave, courageous, gallant, valorous
The doctor‘s valiant efforts finally saved the child‘s life.
医生无畏的努力终于挽救了孩子的生命。
wan adj.苍白的
同pale, pallid, colorless, bloodless, ashen
Tony looked so wan and tired that I knew something must be wrong.
托尼看起来是如此的苍白与疲惫，我知道一定出事了。
yoke n.轭；束缚
同bond, chain, link, tie, union
The farmer put a yoke on the oxen‘s necks and began to plow his fields.农夫把轭套在牛的脖子上，开始耕田。
Exercise: Fill in the blanks.
1. The _____ spread of the disease caused panic among the people of the country.
2. Although she was _____ to go, Tina came to the Assassin concert with me.
3. There were many _____ in organizing the business conference, but we finally succeeded.
4. Allan, who is anything but _____, often strikes up conversations with complete strangers.
5. Although she is a very accomplished pianist, she has a very _____ personality.
解答：1. Rampant 2. Reluctant 3. Setbacks 4. Timid 5. unassuming www.59wj.com 如果觉得《《托福高阶词汇》LIST15》托福词汇考试指导,tofu不错，可以推荐给好友哦。