Nelsonite
钛铁磷灰岩
🗣️ 情景例句
Your downstairs neighbor let me in.
楼下的邻居让我进来的。
Necessity is the mother of invention.
穷则变，变则通。
He set out to discover whether the wagging dance showed direction.
他开始着手找出摇摆舞是否表示方向。