_earth不会被Vue代理

Earth和Cesium的相关变量放在vue中，必须使用下划线作为前缀！
以_earth为例，在声明 _earth 的组件（比如是EarthComp.vue）中，如果存在子组件A.vue，A.vue需要用到_earth，但通过（:earth=_earth）的方式将_earth传到子组件，子组件无法接收到_earth。
请问有什么好的解决方案吗？

Start by reproducing the prop-passing case described between EarthComp.vue and A.vue, focusing on the :earth=_earth binding and the child component's received value. Review the project's Vue and EarthSDK setup before deciding on a solution; done means the child can reliably receive the Earth-related value without requiring the underscore workaround.

Written by the indexing model from the issue text.