核心词议：
n. 三十年代
num. 三十
adj. 三十个的
thirty 基本解释
n. 三十；三十个；三十年代；三十的记号
adj. 三十的，三十个的
num. 三十；三十个
adj. 三十的，三十个的
num. 三十；三十个
速记方法
速记技巧 词源考究法 来自three，三，-ty，十，词源同ten.
知识扩展
习语积累 习语 num. in your thirties 30多岁 between the ages of 30 and 39
thirty 变化形式
复数： thirties
中文词源： thirty 三十 来自 three,三，-ty,十，词源同 ten. thirty
精选例句
1、 The path to Dawson was covered with thirty feet of wet snow that could fall without warming.
通往道森的小路上覆盖着30英尺厚的湿雪，即使下下来也不会变暖。[机器自动翻译，如有错误，感谢纠错]
2、 She thinks nothing of walking thirty miles a day.
她认为一天步行三十英里不足为奇。
1、 Thirty years after he imagined the city, Park’s baby is close to 70 percent built, with 36,000 people living in the business district and 90,000 residents in greater Songdo.
30年后，朴槿惠设想的城市已经建成了近70%，商业区有3.6万人居住，大松岛地区有9万居民。
1、 Data from the last thirty years leads to a conclusion that is not scientifically challengeable： thinking well requires knowing facts, and that’s true not only because you need something to think about.
过去三十年的数据得出了一个在科学上没有挑战性的结论:善于思考需要了解事实，这不仅是因为你需要思考一些东西。
1、 “Thirty years ago, it would have been inconceivable to have imagined a ban on smoking in the workplace or in pubs, and yet that is what we have now.
30年前，在工作场所或酒吧禁烟是不可想象的，但我们现在已经禁烟了。
常见考点例句：
- Thirty minutes of sex burns 85 calories or more .
- 三十分钟的性可以烧掉85卡路里或更多的热量。
- These are seventy dollars and those are thirty dollars .
- 这双是七十元，那双是三十元。
- An experimental innovator would go back to haiti thirty times .
- 一个试验型的创作者会重返海地多达三十次。
- But in thirty years , only seven acres have been uncovered .
- 但是三十年来，仅找遍了七英亩。
- Thirty years later , it was covered with trees .
- 但三十年以后，陆地都被树林所覆盖。
