Harkerite
硼硅钙镁石
🗣️ 情景例句
She's an easy-going teacher.
她是位随和的老师。
You are fatter than I am.
你比我胖。
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。