You know that the periodofavailability of your ticket is only a days.
您知道，您的客票有效期只有a天。
2
Service of credits will be given if uptime availability is not guaranteed after a specified periodof time with the following exceptions.
如果在一段规定时期之后不再保证正常运行时间有效性，那么将提供信用服务，以下情况除外。
3
It also includes the sustainment and the maintenance of the installation for a periodof 18 years, with guaranteed levels of operational availability of 98% for the radar and its infrastructure.