You're not supposed to copy this piece because it's supposed to be only performed in the Sistine Chapel.

人们不允许复制那首乐曲,因为它应该只在西斯廷教堂里演奏

耶鲁公开课 - 聆听音乐课程节选

You really need that because if you have only one copy of something, you don't have a backup; so, you can store the one copy separately.

你真的很需要这项发明,因为要是你只有一份的话，你就没有备份;,这样的话，你就可以将副本单独留存。

耶鲁公开课 - 金融市场课程节选

He tries not only to copy European absolutism, but to open up Russia to commerce, realizing that trade meant wealth and that wealth meant improvements in the lives of the Russian people.

他不仅试图仿效欧洲的绝对主义,也开放了俄国的商业贸易,他意识到贸易意味着财富,而财富则等同于俄国民众生活水平的提高

耶鲁公开课 - 欧洲文明课程节选