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。
For years he has been asking me to collect snails from my garden and take them to him.
多年来,他一直让我把我园子里的蜗牛收集起来给他捎去。