They can change from clear to dark and black again when people touch them.

人们触摸时，它们会从透明变成深色，再变成黑色。

youdao

Part of this change is down to the albedo effect, with white, reflective ice replaced by dark water, which absorbs more of the sun's heat.

这种变化趋势的发生部分是因为黑色的水与白色的冰相比，反射效应低，从而吸收了更多来自太阳的热量。

youdao

I used dark Muscovado sugar instead of white sugar. I'd argue, this was the most significant change I made.

我用黑砂糖代替白糖，我一定要指出，这是我做的最重要的一个决定。

youdao

Well, with the first movement we said he's generally going and that kind of idea, but now it's and we'll explore this when we get to harmony, this idea of major and minor so we're going music and now and that's a change from the dark minor to the brighter major.

在第一乐章,我们说过它大体上,就像这样,但现在,我们讲到和弦时再来研究这个,大调和小调的概念,我们继续听音乐,还有这个,这就是小调到大调间的转变,由阴郁转向明亮

耶鲁公开课 - 聆听音乐课程节选

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