二十减一等于十九。
Twenty cents is a fifth of one dollar.
二十美分是一美元的五分之一。
I count he runs fifteen or sixteen circles, even near twenty circles one time.
我估计他一次要跑十五六圈，或二十圈。
The company Jackie chose planned to employ only one person, but more than twenty people applied for the job.
杰基选择的公司计划只雇用一个人，但有二十多人申请了这个工作。
Twenty one people have been rescued.
目前已有21人获救。
She then laid twenty mattresses one upon another over the three peas, and put twenty feather beds over the mattresses.
她在三粒豌豆上面放了二十床垫子，又在垫子上放了二十床鸭绒被。
In one experiment, they showed pictures of various objects to twenty volunteers and asked them to find just one of those, a banana.
在一项实验中，他们向20名志愿者展示了各种物品的图片，并只让他们找到画有一根香蕉的图片。
We waited twenty-one years, don't fail us now.
我们等了21年，如今不要辜负我们。
I was twenty-two – no, twenty-one.
我那时22岁。—噢不，21岁。
It has now reached a point where a growing number of people believe that it is far too high, and that bringing it down will be one of the great challenges of the twenty first century.
现在，到了越来越多人认为它太高了的程度，而且使它降低将是21世纪最大的挑战之一。
Pick a number from one to twenty.
从一至二十中挑选一个数。
You think your product will appeal most to teachers ages twenty to thirty, so you decide to put your advertisement in their favorite magazine, the one about classroom activities.
你认为你的产品最能吸引20到30岁的老师，所以你决定把你的广告放在他们最喜欢的杂志上，那本关于课堂活动的杂志。
The government implemented a rule that the guinea is worth twenty-one shillings.
政府实施了一项规定，即一几尼价值21先令。
Since its beginning, the program has now grown and has twenty-one therapy dogs and a therapy cat.
从一开始，这个项目就不断扩大，现在有21只治疗犬和一只治疗猫。
I have kept a record of informal conversations involving some 300 students from at least twenty-one colleges and universities.
我记录了来自至少21所高等院校的300名学生的非正式谈话。
That twenty-one ceramic dog figurines were discovered during the excavating of a 1,000-year-old Hohokam village in Tempe, Arizona, has nearly doubled the number of these artifacts known to exist.
在对亚利桑那州坦佩的霍霍坎村进行挖掘时，发现了21件陶制狗像，这使得已知的狗像数量增加了近一倍。
The crown of thorns starfish is large, twenty-five to thirty-five centimeters in diameter, and has seven to twenty-one arms that are covered in spines.
棘冠海星很大，直径长达25到35厘米，有7到21条手臂，上面布满了刺。
About one in twenty of the incidents the volunteers reported were these "programme assembly failures".
志愿者报告的事件中，每 20 个就有一个属于这种程序组合失败。
A noise of one hundred and twenty decibels on land causes pain to human ears.
陆地上120分贝的噪音会使人的耳朵疼痛。
There was less bullying in secondary schools, with about one in twenty-five suffering persistent bullying, but these cases may be particularly recalcitrant.
中学里的霸凌现象较少，约有1/25的学生遭受持续的霸凌，但这些案例可能特别棘手。
I went the wrong way when I was twenty-one, and have never found the right path again.
我21岁时走错了路，再也没有找到正确的路。
Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels.
许多研究人员的工作依赖于海洋声音，他们反对120分贝的限制。
Space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes.
太空西红柿可以保持新鲜二十天，这个时间比普通番茄要长一周。
Twenty percent of us exercise only one to three times a week.
百分之二十的人一周只锻炼一到三次。
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