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Lesson 1: Say who you are
You will learn to introduce yourself and say who someone is.
A1 · 21 steps · about 20 min
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Ireland
アイルランド
A1Beginner
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石英
noun
quartz
B2
- 結晶形の二酸化ケイ素から成る、光沢のある硬い鉱物
- 大抵の岩（特に、砂岩と花崗岩）に含まれる
- 黄砂は、鉄酸化物の不純物が付いた石英である。
quartz
せきえい
B2Upper-Intermediate
This rock contains transparent quartz crystals.