The exposed gold is a kind of gold in the world. It has the characteristics of varied colours, complicated shape, different pellets etc.
明金是可见金的一种，它具有颜色多样，形态复杂和大小不一等特点。
The ink was kept deliberately thin and exposed to air at a precisely controlled temperature, which concentrated the gold particles at the curved upper surface of the fluid.
我们故意把这种墨水保持低浓度，并把它置于精确控制的温度下外露于空气中，这样流体上表面破浪地方的黄金颗粒就能得到浓缩。
Professor: What happens to gold when it is exposed to the air?
教授：黄金暴露在空气中会如何？
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