翻译：He concluded that the depth marked the boundary between a solid mantle and the liquid core
问题描述：
翻译：He concluded that the depth marked the boundary between a solid mantle and the liquid core
答
他总结出：这个距离标志着固体外围和液体核心的分界线.depth不是深度吗，为什么是距离matle不是地幔吗，为什么是外围