Milestones that undergo further, more exhaustivetesting can become major version releases.
里程碑进行进一步的，更详尽的测试可以成为主要版本发布。
2
As a result, very careful planning and exhaustivetesting must first be done in a lab environment.
因此，必须先在实验室环境中进行非常仔细的规划和充分的测试。
3
And it's hard to imagine a simpler program than this. So we very quickly realize that exhaustivetesting is just never feasible for an interesting program.