六级The researchers also acknowledged that there are a few areas where race as a construct might still be useful in scientific research: as a political and social, but not biological, variable.

研究人员还承认，在科学研究中，种族作为一种结构可能在一些领域仍然有用：作为一种政治和社会变量，而不是生物学变量。

2016年12月阅读原文

考研Even though there is plenty of evidence that the quality of the teachers is the most important variable, teachers’ unions have fought against getting rid of bad ones and promoting good ones.

尽管有大量证据表明，教师的素质是最重要的变量，但教师工会一直在反对淘汰劣质教师和推广优秀教师。

2012年考研阅读原文

考研Even though there is plenty of evidence that the quality of the teachers is the most important variable, teachers'unions have fought against getting rid of bad ones and promoting good ones.

尽管有大量证据表明，教师的素质是最重要的变量，但教师工会一直在反对淘汰劣质教师和推广优秀教师。

2012年考研真题（英语一）阅读理解 Section Ⅱ

六级Mandelbrot, who did the experiment with stock exchanges prices, for example, noted that although the outcomes were variable, there were in fact certain constancy

例如，对证券交易所价格进行实验的曼德布罗特指出，尽管结果是可变的，但事实上有一定的恒常性

2013年6月听力原文

六级first, they explain that if a given variable is playing a role in affecting well-being, then we should expect any change in that variable to correlate with the observed changes in well-being.

首先，他们解释说，如果给定变量在影响幸福感方面发挥作用，那么我们应该期望该变量的任何变化都与观察到的幸福感变化相关。

2019年12月六级真题（第一套）阅读 Section B

六级If not, it is not plausible that the variable is a causal factor.

如果不是，则该变量不可能是因果因素。

2019年12月六级真题（第一套）阅读 Section B

六级And at the vast majority of places, it is simply not a big variable in the college’s decision-making process.

在绝大多数地方，这并不是学院决策过程中的一个大变量。

2013年12月六级考试真题（三）

考研One possibility is the variable behavior of the sun.

一种可能性是太阳的多变行为。

1992年全国硕士研究生入学统一考试英语试题

考研The sun is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward.

太阳在长期内也是可变的：其热量输出呈周期性上升和下降，最近的趋势是下降。

1992年全国硕士研究生入学统一考试英语试题

考研And there are long, variable lags before policy changes have any effect on the economy.

在政策变化对经济产生任何影响之前，还有很长的可变滞后期。

1997年全国攻读硕士学位研究生入学考试英语试题