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1. The alumina is a type of mineral that can be used to purify water.
铝土矿是一种可以用来净化水的矿物类型。
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2. The alpine region is known for its beautiful scenery and skiing opportunities.
阿尔卑斯地区以其美丽的风景和滑雪机会而闻名。
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3. The alchemist's quest was to turn base metals into gold through the process of transmutation.
炼金术士的尝试是将贱金属转化为黄金，通过转化过程实现。