The buyer has the right to cancel the contract unilaterally if the seller fails to ship the goods within the L/C validity.
如果卖方不能在信用证有效期内交货的话,买方有权单方面取消合同。
because they are unwilling to have their names entered as having taken out such and such a book,
因为它们不愿让人家记下它们公司的名字和借阅的某一本书。