Porcelain is a hard, white substance made by heating clay, a kind of heavy, sticky material.

瓷器是通过加热黏土制成的一种白色坚硬物质 ，黏土是一种黏性很大的原料。

" You mean...that stuff's your thoughts? " Harry said, staring at the swirling white substance in the basin.

“你是说......这东西是你的思想？”哈利瞪着盆里旋转的银色物质说。

" I'm always tempted to say " white powdery substance" but I guess there's some connotation on that."

“我一直想说是白色粉状物质，不过我想关键是内部的东西。”

The strange, white substance that formed inside his lab canister was chemically inert, meaning it wouldn't react with other substances.

这种在他的实验室罐中形成的奇怪的，白色的物质是惰性的化学物质，就是它不会与其他物质产生反应。

Ultimately, when all the water is gone, you are left with this white crystalline substance.

最终, 当所有的水都流光了, 剩下的就是这种白色结晶物质。

" Beer" often has a white substance at the top of it, on the top of the glass of beer, called " foam." " Here's wishing you a happy voyage home."

“啤酒” 的顶部常常有一种白色的物质，在啤酒杯的顶部， 叫做“泡沫” 。

" Baking soda" is technically known as " sodium bicarbonate." It's a white substance, what we would call a " powder" (powder), that is used in cooking and, again like vinegar, sometimes in cleaning.

“小苏打” 在技术上被称为“碳酸氢钠” 。 它是一种白色物质，我们称之为“粉末” （粉末），用于烹饪，也像醋一样， 有时用于清洁。