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素质是最重要的变量，但教师工会却反对淘汰不合格的教师和提升优秀教师。
They chose this particular behavior for three reasons, according to study co-author Eric Schwitzgebel, a philosopher at the University of California, Riverside: students’ attitudes on the topic are variable and unstable, behavior is easily measurable, and ethics literature largely agrees that eating less meat is good because it reduces environmental harm and animal suffering.
根据该研究的合著者、加州大学河滨分校的哲学家埃里克·施维茨格尔布（Eric Schwitzgebel）的说法，他们选择这一特定行为有三个原因：学生在这个话题上的态度具有可变性和不稳定性，行为容易被测量，而且伦理学文献普遍认为减少吃肉是好的，因为它能减少环境危害和动物痛苦。
Psychologist Nina Strohminger at the University of Pennsylvania, who was not involved in the study, says she wants the effect to be real but cannot rule out some unknown confounding variable.
未参与这项研究的宾夕法尼亚大学心理学家尼娜·斯特罗姆明格表示，她希望这个效果是真实的，但也不能排除某些未知的混杂变量的影响。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。