1)they can still stop you when you are going through the green channel当你通过绿色通道,他们仍可以拦住你.
2)go through 是通过的词组.在这里are going through 是现在进行时,when正当你.,所以这里没有Be going to...打算做某事,将要做某事的词组.
3）the total absence of fishing boats around the oil rigs.在油井设备周围绝对没有渔船.
4）absence of 缺乏,而the total absence of 就是完全的缺乏=绝对没有
5)the plentiful supply of food thrown overboard by the crews on the rigs在钻机的工作人员向海里抛了充足的食物.
6）plentiful supply 充足的、足够的、许多的