Heptaphyllite
七叶云母(浅云母)
🗣️ 情景例句
Nothing ventured, nothing gained.
不入虎穴，焉得虎子。
You may know the horse by his harness.
欲知马如何，可看套马索。
This platform would serve as a port and a railway station.
如果再建些伸出海面的高大的烟囱状通风管，