1)  renewing
续借
1.
Renewing can extend the holding duration of the book,but is invalid if there is an order in advance from other readers before the renewing.
对借书中常见的续借现象进行分析,续借可以延长持有书籍的时间,但存在续借之前被其他读者预约而使续借失效的可能性。