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。
but they can still stop you when you are going through the Green Channel and have nothing to declare.
但是,当你通过绿色通道,没有任何东西需要申报时,他们仍可以拦住你。