HarperCollins's e-books expire after they have been lent 26 times.

HarperCollins的电子书在借阅26次后失效。

Martin Heidegger, Nietzsche, Vols. 1 and 2, trans. David Farrell Krell (New York: HarperCollins, 1991), 142.

2. 马丁海德格尔，尼采，卷。 1 和 2，反式。 David Farrell Krell（纽约：哈珀柯林斯出版社，1991 年），142。

So publishers keep tweaking their lending arrangements in search of the right balance. Random House raised its licensing prices earlier this year, and HarperCollins limits libraries to lending its titles 26 times.

因此出版商在不断微调他们的借阅合约以找到最恰当的平衡点。兰登书屋在今年早些时候提高了授权价格，哈珀? 柯林斯出版社限制图书馆借阅条目的次数为26次。