Yet only one of his books is now in print, and his vast body of writings on music is unknown save to specialists.
然而，他现在只有一本书在出版，他大量关于音乐的著作只有专家才知道。
The necessary amount of companies' spending on it is unknown.
公司在此方面的必要支出金额尚不清楚。
Then, unknown to the students, the researchers studied their anonymized meal-card purchases for that semester—nearly 14,000 receipts for almost 500 students.
然后，在学生不知情的情况下，研究人员研究了他们该学期匿名的餐卡消费记录——几乎500名学生的近14000张收据。
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。