Acanthite
[机] 螺状硫银矿
🗣️ 情景例句
And you never know
而你永远也猜不到
What kind of quality control do you have?
你们用什么办法来控制质量呢？
The real dividing line between continents and oceans occurs at the foot of a steeper slope.
大陆和海洋的真正分界线是在陡坡脚大陆架慢坡