可以用多久？
- Each Leap Major Release (eg. 42.x) is expected to be supported for at least 36 months , until the next major version of Leap is available (eg. 43.0)
- A Leap Minor Release (eg. 42.1, 42.2, etc) is expected to be released annually, and users are expected to upgrade to the latest minor release within 6 months of its availability, leading to a support life cycle of 18 months