移交阶段 meaning in English

hand-over phase

The at is positioned during the transition phase and is an integral part of the deployment discipline
验收测试被放在移交阶段，并且是部署流程的一个主要部分。
There are limitations to what apis are available in the action vs . render phases that require special considerations in the development of the portlets
在开发portlet中需要特殊考虑的动作对移交阶段里，可获得什么样的api有其局限性。