But one proviso, I said, just one. The opportunity must be the real thing.

不过，我说，我要提出一点，单单一点。机会一定要很有把握。

But your proviso applies to any escape attempt, whether it happens in two years or two days.

但您提出的这一点可以应用到所有逃走的计划上面，两的或两天内的都适用。

There are a few provisos, a couple of quid pro quos.

这儿还有一些(绑定)条款， 一些等价交换。

The definition of that proviso could have been stretched to meet all practical requirements (33 years later, the Star Wars technology is nowhere near useful deployment).

这个附带条件的定义本可以扩展到满足所有实际需求(33，《星球大战》技术还远未得到有效的部署)。

Harry and Hermione felt that it was best not to stay anywhere too long, and Ron agreed, with the sole proviso that their next move took them within reach of a bacon sandwich.

哈利和赫敏一致觉得最好不要在一个地方停留太长时间，罗恩也这样想，但他唯一的要求就是去的地方最好能有咸牛肉三明治。