矽镁层 Traditional 矽鎂層 xī měi céng 🔊 sima (geology) + Keep this word Meanings xī měi céng 矽鎂層 sima (geology)silicon and magnesium layer in earth's crust Its characters 矽xīsilicon (chemistry)镁měimagnesium (chemistry)层céngto pile on top of one anotherHSK 3